Danube–Breg (Donau, Dunăre, Duna, Dunav, Dunaj) is the 2^nd longest river in Europe at 2,888 kilometers (1,795 miles).

Danube–Breg (Donau, Dunăre, Duna, Dunav, Dunaj) is a river that is 2,888 kilometers (or 1,795 miles) long and drains from a 817,000 km² drainage basin in Romania (28.9% of river), Hungary (11.7%), Austria (10.3%), Serbia (10.3%), Germany (7.5%), Slovakia (5.8%), Bulgaria (5.2%) and Croatia (4.5%),.

Its average discharge rate is 7,130 m³/3 and the river flows out into Black Sea.

 Compare Danube–Breg (Donau, Dunăre, Duna, Dunav, Dunaj) with River Medway from Europe.