Just past Astrakhan, the Volga flows into this inland "sea" that is actually a lake
The Volga enters the Caspian Sea 
through the Volga delta at the mouth of the river where the city of Astrakhan is ... 
the flow of water from the Caspian into the Zaliv Kara-Bogaz-Gol,... [DOC] [TLE] Western Asia: Along the coast of the Caspian Sea in Russia ... [PAR] Four rivers traverse the region on their way to the Caspian Sea: Volga, Ural and 
... of its flow is used for irrigation so only flood waters actually reach the sea.