A species of seal indigenous to this body of water migrates every (-5[1])winter to its frozen north or to its largest island of (-5[2])Ogurja (15[1])Ada [oh-GUR-juh AY-duh] to give birth. A city on this body of water has the world’s highest levels of natural background (-5[1])radiation and (-5[1])names a 1971 treaty on wetland conservation. Expanding tea (15[1])plantations on this body of water’s southern coast (-5[1])have threatened the (-5[1])protected Hyrcanian rainforest, where the Jungle Movement briefly established a socialist state (-5[1])centered on the city of (15[1])Rasht. (-5[1])The first offshore (10[1])(*) oil well was built near this body of water’s Absheron Peninsula. (10[5])Astrakhan is the largest (-5[1])city in the Volga (10[1]-5[1])Delta that drains (10[1])into this (10[1])brackish endorheic [en-doh-REE-ik] basin, whose large oil reserves are exported (10[1])west by pipeline from Baku. For 10 points, (10[1])what largest lake in the world (10[1])borders Russia, (10[1])Iran, and Azerbaijan? (10[6]0[2])■END■