Danube

Coordinates: 45°13′3″N 29°45′41″E / 45.21750°N 29.76139°E / 45.21750; 29.76139
Source: Wikipedia, the free encyclopedia.
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Danube river
)

Danube
Serbo-Croatian)
  • Дунав (Bulgarian)
  • Dunărea (Romanian)
  • Дунай (Ukrainian)
  • Location
    Countries
    • Germany
    • Austria
    • Slovakia
    • Hungary
    • Croatia
    • Serbia
    • Bulgaria
    • Romania
    • Moldova
    • Ukraine
    Cities
    Physical characteristics
    SourceBreg
     • locationFurtwangen im Schwarzwald, Baden-Württemberg, Germany
     • coordinates48°05′44″N 08°09′18″E / 48.09556°N 8.15500°E / 48.09556; 8.15500
     • elevation1,078 m (3,537 ft)
    2nd sourceBrigach
     • locationSt. Georgen im Schwarzwald, Baden-Württemberg, Germany
     • coordinates48°06′24″N 08°16′51″E / 48.10667°N 8.28083°E / 48.10667; 8.28083
     • elevation940 m (3,080 ft)
    Source confluence 
     • locationDonaueschingen, Baden-Württemberg, Germany
     • coordinates47°57′03″N 08°31′13″E / 47.95083°N 8.52028°E / 47.95083; 8.52028
    MouthDanube Delta
     • location
    Romania
     • coordinates
    45°13′3″N 29°45′41″E / 45.21750°N 29.76139°E / 45.21750; 29.76139
    Length2,850 km (1,770 mi)[1]
    Basin size801,463 km2 (309,447 sq mi)[2]
    Width 
     • minimumMiddle Danube (Iron Gates) 150 m (490 ft); Lower Danube (Brăila) 400 m (1,300 ft)[3]
     • averageUpper Danube 300 m (980 ft); Middle Danube 400 m (1,300 ft) to 800 m (2,600 ft); Lower Danube 900 m (3,000 ft) to 1,000 m (3,300 ft)[4][3][2]
     • maximumMiddle Danube 1,500 m (4,900 ft); Lower Danube 1,700 m (5,600 ft)[2][3]
    Depth 
     • minimum1 m (3 ft 3 in) (Upper Danube)[2]
     • averageUpper Danube 8 m (26 ft); Middle Danube 6 m (20 ft) to 10 m (33 ft), 53 m (174 ft) (Iron Gates); Lower Danube 9 m (30 ft)[4][3][2][5]
     • maximumMiddle Danube (Iron Gates) 90 m (300 ft); Lower Danube 34 m (112 ft)[3]
    Discharge 
     • locationBefore the Danube Delta
     • average(Period: 1999–2023) 6,484.3 m3/s (228,990 cu ft/s)[7][2]

    (Period: 1840–2006) 6,471 m3/s (228,500 cu ft/s)[4] (Period: 1931–2010) 6,510 m3/s (230,000 cu ft/s)[6]

    (Period: 1970–2015) 6,546 m3/s (231,200 cu ft/s)[8]
     • minimum1,790 m3/s (63,000 cu ft/s)[6]
     • maximum15,900 m3/s (560,000 cu ft/s)[6]
    Discharge 
     • locationBelgrade, Serbia
     • average5,600 m3/s (200,000 cu ft/s)
    Discharge 
     • locationBudapest, Hungary
     • average2,350 m3/s (83,000 cu ft/s)
    Discharge 
     • locationVienna, Austria
     • average1,900 m3/s (67,000 cu ft/s)
    Discharge 
     • locationPassau, Bavaria, Germany
    30 km (19 mi) before town
     • average580 m3/s (20,000 cu ft/s)

    The Danube (

    Southeastern Europe, from the Black Forest south into the Black Sea. A large and historically important river, it was once a frontier of the Roman Empire. In the 21st century, it connects ten European countries, running through their territories or marking a border. Originating in Germany, the Danube flows southeast for 2,850 km (1,770 mi), passing through or bordering Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and Ukraine. Among the many cities on the river are four national capitals: Vienna, Bratislava, Budapest, and Belgrade
    . Its drainage basin amounts to 817,000 km² and extends into nine more countries.

    The Danube's longest headstream Breg rises in Furtwangen im Schwarzwald, while the river carries its name from its source confluence in the palace park in Donaueschingen onwards. Since ancient times, the Danube has been a traditional trade route in Europe. Today, 2,415 km (1,501 mi) of its total length are navigable. The Danube is linked to the North Sea via the Rhine–Main–Danube Canal, connecting the Danube at Kelheim with the Main at Bamberg. The river is also an important source of hydropower and drinking water.

    The Danube river basin is home to such fish species as

    seabass, mullet, and eel, inhabit the Danube Delta
    and the lower portion of the river.

    Names and etymology

    Other names

    Today the river carries its name from its source confluence in Donaueschingen onwards. Its longest headstream Breg rises in Furtwangen im Schwarzwald. The river was known to the

    Iranic turos 'swift' and Sanskrit iṣiras (इषिरस्) 'swift', from the PIE *isro-, *sreu 'to flow'.[10]

    In the Middle Ages, the Greek Tiras was borrowed into Italian as Tyrlo and into Turkic languages as Tyrla; the latter was further borrowed into Romanian as a regionalism (Turlă).[10]

    The Thraco-Phrygian name was Matoas,[11] "the bringer of luck".[12]

    The

    Middle Mongolian name for the Danube was transliterated as Tho-na in 1829 by Jean-Pierre Abel-Rémusat.[13]

    The modern languages spoken in the Danube basin all use names related to

    Latin
    : Dānuvius:
    German: Donau (IPA: [ˈdoːnaʊ] ); Romanian: Dunărea (IPA: [ˈdunəre̯a]; via German);[14] Bavarian: Doana; Silesian: Dōnaj; Upper Sorbian: Dunaj (IPA: [ˈdunaj]); Czech: Dunaj (IPA: [ˈdunaj]); Slovak: Dunaj (IPA: [ˈdunaj]); Polish: Dunaj (IPA: [ˈdunaj] ); Hungarian: Duna (IPA: [ˈdunɒ] ); Slovene: Donava (IPA: [ˈdóːnaʋa]);
    Serbo-Croatian: Dunav / Дунав (IPA: [dǔna(ː)ʋ]
    ); Bulgarian: Дунав, romanizedDunav (IPA: [ˈdunɐf]); Russian: Дунай, romanizedDunaj (IPA: [dʊˈnaj]); Ukrainian: Дунай, romanizedDunai (IPA: [dʊˈnɑj]); Greek: Δούναβης (IPA: [ˈðunavis]); Italian: Danubio (IPA: [daˈnuːbjo]); Spanish: Danubio; (IPA: [daˈnuβjo]); Turkish: Tuna; Romansh: Danubi; Albanian: Danub, Albanian definite form: Danubi.[15]

    Etymology

    Danube is an

    Scythian as in Avestan was a generic word for "river": Dnieper and Dniestr, from Danapris and Danastius, are presumed to continue Scythian *dānu apara "far river" and *dānu nazdya- "near river", respectively.[17]

    In Latin, the Danube was variously known as Danubius, Danuvius, Ister

    -ouwe
    "wetland".

    Romanian differs from other surrounding languages in designating the river with a feminine term, Dunărea (IPA: [ˈdunəre̯a]).[10] This form was not inherited from Latin, although Romanian is a Romance language.[14] To explain the loss of the Latin name, scholars who suppose that Romanian developed near the large river propose[14] that the Romanian name descends from a hypothetical Thracian *Donaris. The Proto-Indo-European root of this presumed name is related to the Iranic word "don-"/"dan-", while the supposed suffix -aris is encountered in the ancient name of the Ialomița River, Naparis, and in the unidentified Miliare river mentioned by Jordanes in his Getica.[10] Gábor Vékony says that this hypothesis is not plausible, because the Greeks borrowed the Istros form from the native Thracians.[14] He proposes that the Romanian name is a loanword from a Turkic language (Cuman or Pecheneg).[14]

    Geography

    The Danube basin
    The hydrogeographical source of the Danube at St. Martin's Chapel in Furtwangen im Schwarzwald: the Bregquelle, the source of the Danube's longest headstream, the Breg, where the Danube is symbolized by the Roman allegory for the river, Danuvius.
    The symbolical source of the Danube in Donaueschingen: the source of the Donaubach (Danube Brook), which flows into the Brigach.

    Classified as an

    international waterway, it originates in the town of Donaueschingen, in the Black Forest of Germany, at the confluence of the rivers Brigach and Breg. The Danube then flows southeast for about 2,730 km (1,700 mi), passing through four capital cities (Vienna, Bratislava, Budapest, and Belgrade) before emptying into the Black Sea via the Danube Delta in Romania and Ukraine
    .

    Once a long-standing frontier of the Roman Empire, the river passes through or touches the borders of 10 countries: Romania (29.0% of basin area), Hungary (11.6%), Serbia (10.2%), Austria (10.0%), Germany (7.0%), Bulgaria (5.9%), Slovakia (5.9%), Croatia (4.4%), Ukraine (3.8%), and Moldova (1.6%).[21] Its drainage basin extends into nine more (ten if Kosovo is included).

    Drainage basin

    In addition to the bordering countries (see above), the drainage basin includes parts of nine more countries: Bosnia and Herzegovina (4.6% of the basin area), the Czech Republic (2.9%), Slovenia (2.0%), Montenegro (0.9%), Switzerland (0.2%), Italy (<0.15%), Poland (<0.1%), North Macedonia (<0.1%) and Albania (<0.1%).[21] The total drainage basin is 801,463 km2 (309,447 sq mi) in area,[22][23] and is home to 83 million people.[24] The highest point of the drainage basin is the summit of Piz Bernina at the Italy–Switzerland border, at 4,049 m (13,284 ft).[25] The Danube River Basin is divided into three main parts, separated by "gates" where the river is forced to cut through mountainous sections:[24]

    Discharge

    Mean annual discharge on the hydrological stations (period from 2000 to 2023); 1 - Reni, Isaccea; 2 - Silistra; 3 - Pristol; 4 - Batina, Bezdan; 5 - Nagymaros, Szob; 6 - Bratislava, Wolfsthal; 7 - Untergriesbach[2][26][7]

    Year Mean annual discharge (m3/s)
    1 2 3 4 5 6 7
    2000 6,580.6 6,198.1 5,585.9 2,669.4 2,627.2 2,337.9 1,667.2
    2001 6,304.3 5,919.4 5,421.8 2,432.5 2,382.3 2,231.3 1,627.6
    2002 6,837.1 6,100.1 5,392 2,824.9 2,855.6 2,683 1,803.9
    2003 5,021 4,571 3,825 1,786 1,722 1,647 1,153
    2004 6,524 6,088 5,233 2,025 2,013 1,852 1,213
    2005 8,711 7,659 6,396 2,420 2,329 2,115 1,359
    2006 8,428 7,370 6,616 2,110 2,503 2,186 1,396
    2007 5,626 5,195 4,512 2,182 2,136 1,916 1,287
    2008 5,909 5,358 4,736 2,163 2,079 1,876 1,339
    2009 6,492 5,990 5,412 2,607 2,441 2,186 1,433
    2010 9,598 8,515 7,424 2,879 2,615 2,130 1,420
    2011 5,303 2,000
    2012 5,053 2,240
    2013 7,164 6,558 5,946 2,863 2,684 2,417 1,671
    2014 7,446 6 901 5,756 2,198 2,036 1,788 1,237
    2015 6,138 5,722 4,971 2,030 1,903 1,629 1,240
    2016 6,465 5,993 5,339 2,261 2,196 1,944 1,412
    2017 5,202 4,813 4,270 2,143 2,041 1,844 1,307
    2018 6,487.8 5,875.5 4,891 1,906.3 1,808.1 1,644.1 1,227.8
    2019 5,579 5,168 4,593 2,253 2,114 1,962 1,446
    2020 4,893.5 4,659 4,095 2,215 2,026 1,841 1,285
    2021 5,998 5,505 4,696 2,178 2,028 1,838 1,304
    2022 5,753 2,180
    2023 6,623.8

    Multiannual average, minimum and maximum discharge (water period from 1876 to 2010)[27]

    Station Discharge (m3/s)
    Min Mean Max
    Ceatal Izmail 1,889 6,489 14,673
    Reni, Isaccea 1,805 6,564 14,820
    Zimnicea, Svishtov 1,411 6,018 14,510
    Orșova 1,672 5,572 13,324
    Veliko Gradište 1,461 5,550 14,152
    Pančevo 1,454 5,310 13,080
    Bogojevo 959 2,889 8,153
    Bezdan, Batina 749 2,353 7,043
    Mohács 667 2,336 7,227
    Nagymaros, Szob 628 2,333 7,057
    Bratislava 633 2,059 7,324
    Vienna 506 1,917 6,062
    Krems an der Donau 596 1,845 5,986
    Linz 468 1,451 4,783
    Hofkirchen 211 638 1,943
    Regensburg 128 444 1,330
    Ingolstadt 83 312 965
    Ulm 6 38 153

    Simulated water and suspended sediment results from climate-driven decadal study (with STD through specific decade)[28]

    Water period Average precipitation

    in the basin (mm)

    Average temperature

    in the basin (°C)

    Average discharge

    (m3/s)

    Sediment load

    (106 tons)

    1530–1540 794 9.0 6,207 72.9
    1650–1660 885 8.4 7,929 67,3
    1709–1719 861 8.3 7,616 52.91
    1770–1780 865 8.9 7,728 74.1
    1940–1950 778 8.9 7,209 55.0
    1960–1970 850 8.8 7,399 73.0
    1975–1985 818 9.0 7,186 77.8
    1990–2000 790 9.5 6,570 73.8

    Discharge chronology

    Historical average flow to the present day; Measured and reconstructed average water flows from 1742. The reconstructed and observed streamflow (Q – m3/s) at Ceatal Izmail for the 1742 to 2022:[29][30][31][32][33]

    Year m3/s Year m3/s Year m3/s Year m3/s Year m3/s Year m3/s
    Reconstructed
    1742 5,780 1751 6,760 1761 6,470 1771 9,700 1781 5,830 1791 5,540
    1743 5,355 1752 7,090 1762 6,510 1772 6,050 1782 6,470 1792 6,930
    1744 5,370 1753 4,980 1763 5,950 1773 4,600 1783 7,930 1793 7,800
    1745 4,940 1754 6,330 1764 6,280 1774 6,150 1784 8,400 1794 5,230
    1746 7,140 1755 6,840 1765 6,130 1775 6,060 1785 7,610 1795 6,530
    1747 5,850 1756 6,370 1766 8,530 1776 6,320 1786 6,570 1796 6,460
    1748 6,840 1757 6,830 1767 6,850 1777 5,530 1787 6,980 1797 6,700
    1749 6,690 1758 8,410 1768 8,400 1778 7,470 1788 5,860 1798 6,560
    1750 5,180 1759 5,520 1769 5,720 1779 6,600 1789 7,190 1799 9,590
    1760 6,840 1770 10,700 1780 6,990 1790 6,940 1800 6,150
    5,905 6,597 7,154 6,547 6,978 6,749
    1801 7,310 1811 8,220 1821 6,390 1831 6,670 1841 6,210 1851 7,350
    1802 6,590 1812 5,230 1822 5,700 1832 4,820 1842 5,340 1852 6,550
    1803 6,870 1813 6,680 1823 6,520 1833 5,350 1843 6,710 1853 7,800
    1804 6,220 1814 7,290 1824 6,420 1834 6,470 1844 6,960 1854 5,060
    1805 7,010 1815 6,640 1825 8,040 1835 7,040 1845 7,440 1855 7,020
    1806 6,830 1816 8,090 1826 5,800 1836 9,740 1846 6,750 1856 5,390
    1807 7,000 1817 8,650 1827 6,650 1837 6,770 1847 7,070 1857 4,880
    1808 5,600 1818 6,920 1828 8,140 1838 10,440 1848 5,620 1858 5,580
    1809 7,150 1819 6,470 1829 8,280 1839 9,960 1849 5,360 1859 5,630
    1810 8,430 1820 6,560 1830 7,790 1840 5,560 1850 7,360 1860 7,220
    6,901 7,075 6,973 7,282 6,482 6,248
    1861 5,980 1871 8,860 1881 8,320 1891 5,440 1901 5,570 1911 5,120
    1862 5,040 1872 5,970 1882 5,130 1892 5,620 1902 5,650 1912 6,940
    1863 3,340 1873 5,150 1883 7,590 1893 5,710 1903 5,490 1913 6,410
    1864 6,150 1874 4,680 1884 5,250 1894 4,770 1904 4,940 1914 6,560
    1865 5,690 1875 5,360 1885 5,430 1895 6,240 1905 6,100 1915 9,540
    1866 3,780 1876 7,520 1886 5,660 1896 6,470 1906 6,190 1916 7,550
    1867 6,350 1877 6,660 1887 5,340 1897 7,700 1907 6,770 1917 6,410
    1868 5,660 1878 7,040 1888 6,800 1898 4,550 1908 4,400 1918 4,300
    1869 5,370 1879 8,300 1889 6,530 1899 4,500 1909 5,590 1919 7,410
    1870 7,470 1880 5,660 1890 4,650 1900 6,900 1910 7,450 1920 6,720
    5,483 6,520 6,070 5,790 5,815 6,770
    Observed
    1921 3,906 1931 6,706 1941 9,916 1951 6,368 1961 5,860 1971 5,272
    1922 6,530 1932 6,181 1942 7,266 1952 5,850 1962 6,628 1972 6,160
    1923 6,430 1933 6,344 1943 4,308 1953 6,117 1963 6,047 1973 5,766
    1924 6,700 1934 5,644 1944 7,190 1954 6,168 1964 5,259 1974 7,258
    1925 5,255 1935 5,718 1945 5,870 1955 8,834 1965 8,400 1975 7,190
    1926 8,144 1936 6,392 1946 4,684 1956 7,100 1966 7,954 1976 6,567
    1927 5,990 1937 8,325 1947 5,418 1957 6,254 1967 7,500 1977 7,073
    1928 5,005 1938 6,867 1948 6,357 1958 6,340 1968 5,660 1978 7,120
    1929 5,330 1939 6,310 1949 4,301 1959 5,375 1969 7,710 1979 7,747
    1930 5,197 1940 9,533 1950 5,130 1960 6,514 1970 9,602 1980 8,767
    5,888 6,802 6,044 6,492 7,062 6,892
    1981 8,172 1991 6,274 2001 6,304.3 2011 5,303 2021 6,018
    1982 6,700 1992 5,710.8 2002 6,837.1 2012 5,053 2022 5,753
    1983 5,543 1993 4,873 2003 5,021 2013 7,164 2023 6,623.8
    1984 6,325 1994 6,031.8 2004 6,524 2014 7,446 2024
    1985 6,449 1995 6,223.7 2005 8,711 2015 6,138 2025
    1986 6,257 1996 7,035.8 2006 8,428 2016 6,465 2026
    1987 6,619 1997 6,684.2 2007 5,626 2017 5,202 2027
    1988 6,383 1998 6,804.6 2008 5,909 2018 6,487.8 2028
    1989 5,448 1999 7,951.5 2009 6,492 2019 5,579 2029
    1990 4,194 2000 6,580.6 2010 9,598 2020 4,893.5 2030
    6,209 6,417 6,945 5,973 6,131.6
    Multiannual average discharge 1742 to 2022: ~ 6,500 m3/s

    Tributaries

    The Tisza is the longest tributary of the Danube.

    The land drained by the Danube extends into many other countries. Many Danubian tributaries are important rivers in their own right, navigable by barges and other shallow-draught boats. From its source to its outlet into the Black Sea, its main tributaries are (as they enter):

    1. Iller (entering at Ulm)
    2. Lech
    3. Altmühl (entering at Kelheim)
    4. Naab (entering at Regensburg)
    5. Regen (entering at Regensburg)
    6. Isar
    7. Inn (entering at Passau)
    8. Ilz (entering at Passau)
    9. Enns
    10. Morava (entering near Devín Castle)
    11. Rába (entering at Győr)
    12. Váh (entering at Komárno)
    13. Hron (entering at Štúrovo)
    14. Ipeľ
    15. Sió
    16. Drava (entering near Osijek)
    17. Vuka (entering at Vukovar)

    18. Tisza (entering near Titel)
    19. Sava (entering at Belgrade)
    20.

    Timiș (river) (entering at Pančevo
    )
    21.
    Great Morava (entering near Smederevo)
    22. Mlava (entering near Kostolac)
    23. Karaš (entering near Banatska Palanka)
    24. Jiu (entering at Bechet)
    25. Iskar (entering near Gigen)
    26. Olt (entering at Turnu Măgurele)
    27. Osam (entering near Nikopol, Bulgaria)
    28. Yantra (entering near Svishtov)
    29. Argeș (entering at Oltenița)
    30. Ialomița
    31. Siret (entering near Galați)
    32. Prut (entering near Galați)

    Cities and towns

    3-color confluence of (from left to right) Inn, Danube, and Ilz in Passau

    The Danube flows through many cities, including four national capitals (shown below in bold), more than any other river in the world. Ordered from the source to the mouth they are:

    Danube in Linz, Austria
    The Danube in Bratislava, Slovakia
    Basilica of Esztergom, Hungary
    Petrovaradin Fortress overlooking the Danube and Novi Sad, regional capital of Vojvodina in Serbia
    Confluence of river Sava into the Danube beneath Fortress in Belgrade, capital of Serbia
    Danube at Nikopol, Bulgaria in winter
    The Danube in Sulina, Romania
    Panorama of the Danube in Vienna
    The Danube Bend is a curve of the Danube in Hungary, near the city of Visegrád. The Transdanubian Mountains lie on the right bank (left side of the picture), while the North Hungarian Mountains on the left bank (right side of the picture).
    Panorama of the Danube in Budapest with the Hungarian Parliament (left)
    Budapest at night
    Panorama of the Danube in Novi Sad from Petrovaradin Fortress, Serbia
    The confluence of the Sava into the Danube at Belgrade. Pictured from Belgrade Fortress, Serbia
    Kalemegdan, Belgrade Serbia
    .
    The Danube entering the Iron Gate at the South-Western end of the Carpathian Mountains. Romania on the left side, Golubac Fortress and Serbia on the right side.

    Islands

    Aerial view of Margaret Island, Budapest, Hungary. There are 15 bridges over the Danube in Budapest.
    Great War Island in Belgrade, Serbia. It is located at the confluence of the Sava and Danube.
    The Ada Kaleh island in the Danube was forgotten during the peace talks at the Congress of Berlin in 1878, which allowed it to remain a de jure Turkish territory and the Ottoman Sultan Abdul Hamid II's private possession until the Treaty of Lausanne in 1923 (de facto until Romania unilaterally declared its sovereignty on the island in 1919 and further strengthened it with the Treaty of Trianon in 1920).[34][35] The island was submerged during the construction of the Iron Gates hydroelectric plant in 1970.

    Sectioning

    • Upper Section: From spring to Devín Gate, at the border of Austria and Slovakia. Danube remains a characteristic mountain river until Passau, with average bottom gradient 0.0012% (12 ppm), from Passau to Devín Gate the gradient lessens to 0.0006% (6 ppm).
    • Middle Section: From Devín Gate to
      Iron Gate
      , at the border of Serbia and Romania. The riverbed widens and the average bottom gradient becomes only 0.00006% (0.6 ppm).
    • Lower Section: From Iron Gate to Sulina, with average gradient as little as 0.00003% (0.3 ppm).

    Modern navigation

    The Danube in Budapest
    Fisherman in the Danube Delta
    Freight ship on the Danube near Vienna

    The Danube is navigable by ocean ships from the Black Sea to Brăila in Romania (the maritime river sector), and further on by river ships to Kelheim, Bavaria, Germany; smaller craft can navigate further upstream to Ulm, Württemberg, Germany. About 60 of its tributaries are also navigable.

    Since the completion of the German

    NATO bombing of three bridges in Serbia during the Kosovo War. Clearance of the resulting debris was completed in 2002, and a temporary pontoon bridge that hampered navigation was removed in 2005.[citation needed
    ]

    At the

    Iron Gate, the Danube flows through a gorge that forms part of the boundary between Serbia and Romania; it contains the Iron Gate I Hydroelectric Power Station dam, followed at about 60 km (37 mi) downstream (outside the gorge) by the Iron Gate II Hydroelectric Power Station
    . On 13 April 2006, a record peak discharge at Iron Gate Dam reached 15,400 m3/s (540,000 cu ft/s).

    There are three artificial waterways built on the Danube: the

    Danube-Black Sea Canal, between Cernavodă and Constanța (Romania) finished in 1984, shortens the distance to the Black Sea by 400 km (250 mi); the Rhine–Main–Danube Canal is about 171 km (106 mi), finished in 1992, linking the North Sea to the Black Sea.[36] A Danube-Aegean canal has been proposed.[37]

    Danube River cruise for sightseeing is popular, especially between Passau, Germany, to Budapest, Hungary.[38]

    Piracy

    In 2010–12, shipping companies, especially from Ukraine, claimed that their vessels suffered from "regular pirate attacks" on the Serbian and the Romanian stretches of the Danube.[39][40][41] However, the transgressions may not be considered acts of piracy, as defined according to the United Nations Convention on the Law of the Sea, but rather instances of "river robbery".[42]

    On the other hand, media reports say the crews on transport ships often steal and sell their own cargo and then blame the plundering on "pirates", and the alleged attacks are not piracy but small-time contraband theft along the river.[43]

    Danube Delta

    Russian-speaking Lipovans in the Danube Delta

    The Danube Delta (Romanian: Delta Dunării pronounced [ˈdelta ˈdunərij]; Ukrainian: Дельта Дунаю, romanizedDel'ta Dunayu) is the largest river delta in the European Union. The greater part of the Danube Delta lies in Romania (Tulcea county), while its northern part, on the left bank of the Chilia arm, is situated in Ukraine (Odesa Oblast). The approximate surface is 4,152 km2 (1,603 sq mi), of which 3,446 km2 (1,331 sq mi) are in Romania. If one includes the lagoons of Razim-Sinoe (1,015 km2 (392 sq mi) of which 865 km2 (334 sq mi) water surface), which are located south of the delta proper, but are related to it geologically and ecologically (their combined territory is part of the World Heritage Site), the total area of the Danube Delta reaches 5,165 km2 (1,994 sq mi).

    The Danube Delta is also the best-preserved river delta in Europe, a

    UNESCO World Heritage Site (since 1991) and a Ramsar Site. Its lakes and marshes support 45 freshwater fish species. Its wetlands support vast flocks of migratory birds of over 300 species, including the endangered pygmy cormorant (Phalacrocorax pygmaeus). These are threatened by rival canalization and drainage schemes such as the Bystroye Canal.[44]

    2022 heat wave

    In 2022, there was a major heat wave in Europe. As a result, there was less water flowing in the rivers. As the water level decreased, a number of ship wrecks from World War II emerged in the Danube River. Many of the ships were from Nazi Germany's Black Sea Fleet and had been scuttled to stop them from falling into enemy hands.[45]

    International cooperation

    Ecology and environment

    Pelicans
    in the Danube Delta, Romania

    The International Commission for the Protection of the Danube River (ICPDR) is an organization that consists of 14 member states (Germany, Austria, the Czech Republic, Slovakia, Slovenia, Hungary, Croatia, Bosnia and Herzegovina, Serbia, Bulgaria, Romania, Moldova, Montenegro, and Ukraine) and the

    Danube Strategy
    .

    Navigation

    The Danube Commission is concerned with the maintenance and improvement of the river's navigation conditions. It was established in 1948 by seven countries bordering the river. Members include representatives from Austria, Bulgaria, Croatia, Germany, Hungary, Moldova, Slovakia, Romania, Russia, Ukraine, and Serbia; it meets regularly twice a year. It also convenes groups of experts to consider items provided for in the commission's working plans.

    The commission dates to the Paris Conferences of 1856 and 1921, which established for the first time an international regime to safeguard free navigation on the Danube. Today the Commission include riparian and non-riparian states.

    Geology

    Iron Gates
    , Serbia-Romania border
    Iron Gate II Hydroelectric Power Station, Romania-Serbia

    Although the

    European Watershed
    .

    Before the last

    underfit stream
    .

    Đerdap national park
    )

    Since the Swabian Alb is largely shaped of porous limestone, and since the Rhine's level is much lower than the Danube's, today subsurface rivers carry much water from the Danube to the Rhine. On many days in the summer, when the Danube carries little water, it completely oozes away noisily into these underground channels at two locations in the Swabian Alb, which are referred to as the Donauversickerung (Danube Sink). Most of this water resurfaces only 12 km (7.5 mi) south at the Aachtopf, Germany's wellspring with the highest flow, an average of 8,500 L/s (300 cu ft/s), north of Lake Constance—thus feeding the Rhine. The European Water Divide applies only for those waters that pass beyond this point, and only during the days of the year when the Danube carries enough water to survive the sinkholes in the Donauversickerung.

    Since such large volumes of underground water erode much of the surrounding limestone, it is estimated that the Danube upper course will one day disappear entirely in favor of the Rhine, an event called stream capturing.

    The hydrological parameters of Danube are regularly monitored in Croatia at Batina, Dalj, Vukovar and Ilok.[46]

    History

    Combat between Russian and Turkish forces on the Danube in 1854, during the Crimean War (1853–1856)

    The Danube basin was the site of some of the earliest human cultures. The Danubian Neolithic cultures include the Linear Pottery cultures of the mid-Danube basin. Many sites of the sixth-to-third millennium BCE Vinča culture, (Vinča, Serbia) are sited along the Danube. The third millennium BCE Vučedol culture (from the Vučedol site near Vukovar, Croatia) is famous for its ceramics.

    invade European Scythia and to subdue the Scythians
    .

    Alexander the Great defeated the Triballian king Syrmus and the northern barbarian Thracian and Illyrian tribes by advancing from Macedonia as far as the Danube in 336 BCE.

    Under the Romans, the Danube formed the border of the Empire with the tribes to the north almost from its source to its mouth. At the same time, it was a route for the transport of troops and the supply of settlements downstream. From 37 CE to the reign of the Emperor

    Dacia to be created, but in 271 it was abandoned by emperor Aurelian
    .

    Avars
    used the river as their southeastern border in the 6th century.

    Ancient cultural perspectives of the lower Danube

    Part of the rivers Danubius or Istros was also known as (together with the Black Sea) the Okeanos in ancient times, being called the Okeanos Potamos (Okeanos River). The lower Danube was also called the Keras Okeanoio (Gulf or Horn of Okeanos) in the Argonautica by Apollonius Rhodos (Argon. IV. 282).

    At the end of the Okeanos Potamos, is the holy island of Alba (Leuke, Pytho Nisi,

    Hecateus Abderitas refers to Apollo's island from the region of the Hyperboreans, in the Okeanos. It was on Leuke, in one version of his legend, that the hero Achilles was buried (to this day, one of the mouths of the Danube is called Chilia). Old Romanian folk songs recount a white monastery on a white island with nine priests.[47]

    Rivalry along the Danube

    The Holy League took Ottoman-held Buda after a long siege in 1686

    Between the late 14th and late 19th centuries, the

    Ottoman–Hungarian Wars (1366–1526) and Ottoman–Habsburg wars
    (1526–1791) were fought along the river.

    The most important

    Long War (1591–1606), the Battle of Vienna (1683), the Great Turkish War (1683–1699), the Crimean War (1853–1856) and the Russo-Turkish War (1877–1878)
    .

    Second World War

    During the 2011 renovation of the

    far-right Arrow Cross Party, who briefly governed Hungary from 1944.[48]

    Economics

    Drinking water

    Along its course, the Danube is a source of drinking water for about 20 million people.

    Alb-Donau (district) comes from purified water of the Danube. Other cities such as Ulm and Passau
    also use some water from the Danube.

    In Austria and Hungary, most water is drawn from ground and spring sources, and only in rare cases is water from the Danube used. Most states also find it too difficult to clean the water because of extensive pollution; only parts of Romania where the water is cleaner still obtain drinking water from the Danube on a regular basis.[51]

    Navigation and transport

    Fishing from a Zille on the Danube in Lower Austria, 1982

    In the 19th century, the Danube was an important waterway but was, as The Times of London put it, "annually swept by ice that will lift a large ship out of the water or cut her in two as if she were a carrot."[52]

    Today, as

    Danube – Black Sea Canal, with the Port of Constanța
    .

    The waterway is designed for large-scale inland vessels (110 × 11.45 m) but it can carry much larger vessels on most of its course. The Danube has been partly canalized in Germany (5 locks) and Austria (10 locks). Proposals to build a number of new locks to improve navigation have not progressed, due in part to environmental concerns.

    Downstream from the

    Gabčíkovo dam and locks near Bratislava and the two double Iron Gate
    locks in the border stretch of the Danube between Serbia and Romania. These locks have larger dimensions. Downstream of the Iron Gate, the river is free flowing all the way to the Black Sea, a distance of more than 860 kilometres (530 mi).

    The Danube connects with the Rhine–Main–Danube Canal at Kelheim, with the Donaukanal in Vienna, and with the Danube–Black Sea Canal at Cernavodă.

    Apart from a couple of secondary navigable branches, the only major navigable rivers linked to the Danube are the Drava, Sava and Tisa. In Serbia, a canal network also connects to the river; the network, known as the Danube–Tisa–Danube Canals, links sections downstream.

    In the Austrian and German sections of the Danube, a type of flat-bottomed boat called a Zille was developed for use along the river. Zillen are still used today for fishing, ferrying, and other transport of goods and people in this area.

    Fishing

    The importance of fishing on the Danube, which was critical in the Middle Ages, has declined dramatically. Some fishermen are still active at certain points on the river, and the Danube Delta still has an important industry. However, some of the river's resources have been managed in an environmentally unsustainable manner in the past, leading to damage by pollution, alterations to the channel, and major infrastructure development, including large hydropower dams.[53]

    The

    fish pass enabling migration for fish species including the sturgeon, is currently under review by projects such as We Pass.[57]

    The Upper Danube ecoregion alone has about 60 fish species and the Lower Danube–Dniester ecoregion has about twice as many.[58] Among these are an exceptionally high diversity of sturgeon, a total of six species (beluga, Russian sturgeon, bastard sturgeon, sterlet, starry sturgeon and European sea sturgeon), but these are all threatened and have largely–or entirely in the case of the European sea sturgeon–disappeared from the river.[58] The huchen, one of the largest species of salmon, is endemic to the Danube basin, but has been introduced elsewhere by humans.[59]

    Tourism

    The ruins of Aggstein Castle above the Danube
    Wachau Valley near Spitz, Austria

    Important tourist and natural spots along the Danube include the

    Iron Gate in Serbia and Romania, the Danube Delta in Romania, and the Srebarna Nature Reserve
    in Bulgaria.

    Also, leisure and travel cruises on the river are of significance. Besides the often frequented route between Vienna and Budapest, some ships even go from Passau in Germany to the Danube Delta and back. During the peak season, more than 70 cruise liners are in use on the river, while the traffic-free upper parts can only be discovered with canoes or boats.

    The Danube region is not only culturally and historically of importance, but also important for the regional tourism industry due to its fascinating landmarks and sights. With its well established infrastructure regarding cycling, hiking, and travel possibilities, the region along the Danube attracts every year an international clientele. In Austria alone, there are more than 14 million overnight stays and about 6.5 million arrivals per year.[60]

    The Danube Banks in Budapest are a part of Unesco World Heritage sites, they can be viewed from a number of sightseeing cruises offered in the city.

    The Danube Bend is also a popular tourist destination.

    Danube Bike Trail

    The Danube Bike Trail running along the Schlögener Schlinge
    The Danube Bike Trail leading through the city of Linz

    The

    Danube Bike Trail (also called Danube Cycle Path or the Donauradweg) is a bicycle trail along the river. Especially the parts through Germany and Austria are very popular, which makes it one of the 10 most popular bike trails in Germany.[61]

    The Danube Bike Trail starts at the origin of the Danube and ends where the river flows into the Black Sea. It is divided into four sections:

    1. DonaueschingenPassau (559 km or 347 mi)
    2. PassauVienna (340 km or 210 mi)
    3. ViennaBudapest (306 km or 190 mi)
    4. BudapestBlack Sea (1,670 km or 1,040 mi)

    Sultans Trail

    The Sultans Trail is a hiking trail that runs along the river between Vienna and Smederevo in Serbia. From there the Sultans Trail leaves the Danube, terminating in Istanbul. Sections along the river are as follows.

    1. ViennaBudapest (323 km or 201 mi)
    2. BudapestSmederevo (595 km or 370 mi)

    Donausteig

    Resting area along the Donausteig hiking trail near Bad Kreuzen

    In 2010, the Donausteig, a hiking trail from Passau to Grein, was opened. It is 450 km (280 mi) long and it is divided into 23 stages. The route passes through five Bavarian and 40 Austrian communities. A landscape and viewpoints, which are along the river, are the highlights of the Donausteig.[62]

    The Route of Emperors and Kings

    The Route of Emperors and Kings is an international touristic route leading from Regensburg to Budapest, calling in Passau, Linz and Vienna.[63] The international consortium ARGE Die Donau-Straße der Kaiser und Könige, comprising ten tourism organisations, shipping companies, and cities, strives for the conservation and touristic development of the Danube region.[60]

    In medieval Regensburg, with its maintained old town, stone bridge and cathedral, the Route of Emperors and Kings begins. It continues to Engelhartszell, with the only Trappist monastery in Austria. Further highlight-stops along the Danube, include the "Schlögener Schlinge", the city of Linz, which was European Capital of Culture in 2009 with its contemporary art richness, the Melk Abbey, the university city of Krems and the cosmopolitan city of Vienna. Before the Route of Emperors and Kings ends, you pass Bratislava and Budapest, the latter of which was seen as the twin town of Vienna during the times of the Austro-Hungarian Empire. Since ancient Roman times, famous emperors and their retinue traveled on and along the Danube and used the river for travel and transportation. While traveling on the mainland was quite exhausting, most people preferred to travel by ship on the Danube. So the Route of Emperors and Kings was the setting for many important historical events, which characterize the Danube up until today.

    The route got its name from the

    Dürnstein Castle, which is situated above the Danube. The most imperial journeys throughout time were those of the Habsburg family. Once crowned in Frankfurt, the emperors ruled from Vienna and also held in Regensburg the Perpetual Diet of Regensburg
    . Many famous castles, palaces, residences, and state-run convents were built by the Habsburger along the river. Nowadays they still remind us of the bold architecture of the "Donaubarock".

    Today, people can not only travel by boat on the Danube but also by train, by bike on the Danube Bike Trail or walk on the "Donausteig" and visit the UNESCO World Heritage cities of Regensburg, Wachau and Vienna.[64]

    Important national parks

    In popular culture

    16th-century Danube landscape near Regensburg, by Albrecht Altdorfer – a member of the Danube school

    See also

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    External links