The Yantra is a river in northern Bulgaria, a right tributary of the Danube. It is 285 km long, and has a watershed of 7,862 km². Its average discharge at the mouth is 47 m³/s. The Yantra originates from the northern foot of Hadzhi Dimitar Peak in Central Stara Planina, at 1,340 m. In its upper course, it is alternatively known as Etar, its older name. The river flow…The Yantra is a river in northern Bulgaria, a right tributary of the Danube. It is 285 km long, and has a watershed of 7,862 km². Its average discharge at the mouth is 47 m³/s. The Yantra originates from the northern foot of Hadzhi Dimitar Peak in Central Stara Planina, at 1,340 m. In its upper course, it is alternatively known as Etar, its older name. The river flows into the Danube close to Svishtov.