Beluga caviar is caviar consisting of the roe (or eggs) of the beluga sturgeon Huso huso. The fish is found primarily in the Caspian Sea, the world's largest salt-water lake, which is bordered by Iran, Azerbaijan, Kazakhstan, Russia, and Turkmenistan. It can also be found in the Black Sea basin and occasionally in the Adriatic Sea. Beluga caviar is the most expensive type of caviar, with market prices, at the beginning of the millennium, ranging from .