The Danube was once a long-standing frontier of the Roman Empire , and today flows through 10 countries, more than any other river in the world. Originating in Germany , the Danube flows southeast for 2,860 km (1,780 mi), passing through or touching the border of Austria , Slovakia , Hungary , Croatia , Serbia , Romania , Bulgaria , Moldova and Ukraine before emptying into the Black Sea . Its drainage basin extends into nine more countries. The Danube river basin is the most biodiverse region in Europe, and is home to hundreds of fish species, such as pike , Zander , huchen , wels catfish , burbot and tench . It is also home to a large diversity of carp , sturgeon , and salmon /trout . A few species of Euryhaline fish, such as European seabass , mullet , and eel , inhabit the Danube delta and the lower portion of the river.
* 1 Names and etymology
* 2 Geography
* 2.1 Drainage basin * 2.2 Tributaries * 2.3 Cities and towns * 2.4 Islands * 2.5 Sectioning
* 6 International cooperation
* 6.1 Ecology and environment * 6.2 Navigation
* 7 Geology
* 8 History
* 9 Economics
* 9.1 Drinking water * 9.2 Navigation and transport * 9.3 Fishing
* 9.4 Tourism
* 10 Important national parks * 11 Cultural significance * 12 See also * 13 References * 14 External links
NAMES AND ETYMOLOGY
Old European river names derived from a Proto-Indo-European _*dānu_. Other river names from the same root include the Dunajec , Dzvina/ Daugava , Don , Donets , Dnieper , Dniestr and Dysna . In Rigvedic Sanskrit , _dānu_ means "fluid, drop", in Avestan , the same word means "river". In the Rigveda , _Dānu _ once appears as the mother of Vrtra . It is possible that _dānu_ in 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.
Known to the ancient Greeks as the _Istros_ (Ἴστρος) a borrowing from a Daco-Thracian name meaning "strong, swift" (akin to Sanskrit _iṣiras_ "swift"). In Latin, the Danube was variously known as _Danubius, Danuvius_ or as _Ister_. The Dacian /Thracian name was _Donaris_ for the upper Danube and _Istros_ for the lower Danube. The Thraco-Phrygian name was _Matoas_, "the bringer of luck".
The Latin name is masculine, as are all its Slavic names (the name of the Rhine is also masculine in Latin, most of the Slavic languages, as well as in German). The German _Donau_ ( Early Modern German _Donaw, Tonaw_, Middle High German _Tuonowe_ ) is feminine, as it has been re-interpreted as containing the suffix _-ouwe _ "wetland".
The modern languages spoken in the Danube basin all use names related to _Dānuvius_: German : _Donau_ ( ; Bavarian : _Doana_; Yiddish : _Dunay_ דונײַ ); Silesian : _Důnaj_; Upper Sorbian : _Dunaj_; Slovak : _Dunaj_ ( ); Hungarian : _Duna_ ( ); Serbo-Croatian : _Dunav_ / Дунав ( or Romanian : _Dunărea_ ( ); Romani : _Dunaja_ (); Bulgarian : Дунав, _Dunav_ ( ); Ukrainian : Дунай, _Dunai_ ( ); Czech : _Dunaj_ (Czech pronunciation: ); Polish : _Dunaj_ (Polish pronunciation: ); Slovene : _Donava_ ( ); Italian : _Danubio_ ( ); Romansh : _Danubi_.
The Danube basin
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 2,800 km (1,700 mi), passing through four capital cities 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%). Its drainage basin extends into nine more.
In addition to the bordering countries (see above), the drainage basin includes parts of nine more countries: Bosnia and Herzegovina (4.6%), the Czech Republic (2.9%), Slovenia (2.0%), Montenegro (0.9%), Switzerland (0.2%), Italy (
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