River ecosystem, biome, natural environment.

Volga River, Kuibyshev Reservoir (Eastern Europe, Volga River Basin, Western Russia). Water supply system: Kuibyshev reservoir. - R. Volga - Saratov reservoir. - Volgograd reservoir. - R. Volga - Caspian Sea. Season: autumn Month: October Time of day: day Shooting depth: about 5 meters #ecosystem #biome #nature