Danube–Breg (Donau, Dunăre, Duna, Dunav, Dunaj) is the 2nd longest river in Europe at 2,888 kilometers (1,795 miles).
Danube–Breg (Donau, Dunăre, Duna, Dunav, Dunaj) is a 2,888-km long (1,795 miles) river that drains from a 817,000-km2 wide 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.
Dnieper is the 3rd largest river by drainage area in Europe at 516,300 km2.
Dnieper is a river that stretches 2,287 kilometers (or 1,421 miles) in length, draining from a 516,300 km2 basin in Russia, Belarus and Ukraine.
Its average discharge rate is 1,670 m3/3 and the river flows out into Black Sea.
More on the longest and largest river systems in the world: