<P> 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 2,850 km ( 1,770 mi ) , passing through or touching the border of Austria , Slovakia , Hungary , Croatia , Serbia , Romania , Bulgaria , Moldova and Ukraine before draining into the Black Sea . Its drainage basin extends into nine more countries . The Danube river basin is home to fish species such as pike , zander , huchen , wels catfish , burbot and tench . It is also home to a large diversity of carp and sturgeon , as well as salmon and 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 . </P>
<P> 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 2,850 km ( 1,770 mi ) , passing through or touching the border of Austria , Slovakia , Hungary , Croatia , Serbia , Romania , Bulgaria , Moldova and Ukraine before draining into the Black Sea . Its drainage basin extends into nine more countries . The Danube river basin is home to fish species such as pike , zander , huchen , wels catfish , burbot and tench . It is also home to a large diversity of carp and sturgeon , as well as salmon and 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 . </P>
into what body of water does the danube river flow
into what body of water does the danube river flow
Black Sea
Black Sea