What body of water flows into the captain sea?

~Hello there!

Your question: What body of water flows into the Caspian Sea.

Your  River is the body water that flows into the Caspian Sea.
There are over 130 river that flows into the Caspian Sea with the Volga River been the largest river that flows into the Caspian Sea.

Hope this helps! :3

Brazzaville and kinshasha, luanda,librevilleand and monrovia.