Caspian Sea, duuno area aur volume se dunia ke sab se barraa lake hae. Iske surface area 371,000 square kilometres (143,244 mi²) aur volume 78,200 cubic kilometres (18,761 mi³) hae. Iske chaaro taraf jamiin hae aur ii Russia aur Iran ke biich me hae. Iske east me Kazakhstan aur Turkmenistan, aur west me Azerbaijan hae. Iske sab se jaada gahiraai 1025 meters (3,363 ft) hae. Iske salinity approximately 1.2% hae, jon ki normal samundar ke paani ke one-third hae.