List of tributaries of the Danube
The Danube is Europe's second-longest river. It starts in the Black Forest in Germany as two smaller rivers—the Brigach and the Breg—which join at Donaueschingen, and it is from here that it is known as the Danube, flowing generally eastwards for a distance of some , passing through several Central and Eastern European capitals, before emptying into the Black Sea via the Danube Delta in Romania.
Yantra (river)
The Yantra () is a river in northern Bulgaria, a right tributary of the Danube. It is long (the second longest Bulgarian tributary of the Danube, after Iskar) and has a watershed of .
The Yantra has its source from the northern foot of Hadzhi Dimitar Peak in Central Stara Planina, at . In its upper course, it is often called "Etar" (Етър), its older name. The river flows into the Danube close to Svishtov.