The Caspian Sea is a giant lake with no ocean outlet

The Caspian Sea, the world's largest inland body of water, is unique because it's landlocked, meaning it has no natural connection to any ocean. This massive lake, larger than many seas, borders five nations: Russia, Kazakhstan, Turkmenistan, Iran, and Azerbaijan. It receives water from major rivers like the Volga, but its only water loss is through evaporation.