Europe's longest river drains a vast share of European Russia, and this Volga River Basin map traces the whole system from headwater tributaries to the Caspian Sea. The river network is mapped segment by segment, while the Caspian itself is shaded by depth, from the shallow northern shelf to basins deeper than 750 metres. A clear, zoomable reference for hydrology courses, environmental education and water resource management across one of the world's great watersheds.