Caspian Sea is the largest lake by surface area in the world at 371,000 km².

Despite its name, the Caspian Sea is often regarded as the world's largest lake. It is an endorheic basin, a basin without outflows, bordered by both Europe and Asia. Its salinity is also a third the salinity of most seawater. At 1,025 meters deep, the Caspian Sea is also the world's third deepest lake.

Containing up to 78,200 km³ of water, Caspian Sea has a maximum depth of 1,025 meters and spans a surface area of 371,000 km².

It spans 1,199 km on its length. Countries along its shoreline in Asia: Azerbaijan, Russia, Turkmenistan, Azerbajian, Iran.

 Compare Caspian Sea with Lake Tazawa from Japan.

 Compare Caspian Sea with Qinghai Lake from China.