Which rivers supply most of the water flowing into the Caspian Sea?

The vast majority of the water flowing into the Caspian Sea is supplied by three major rivers: the Volga, the Ural, and the Terek. These rivers empty into the northern part of the sea, and their combined annual discharge accounts for approximately 88 percent of all river water entering the basin.1

Additional, though significantly smaller, contributions come from rivers along the western shore, such as the Kura, the Sulak, and the Samur, which together provide about 7 percent of the total inflow. The remainder of the water is supplied by various rivers along the southern, Iranian shore.1