Lake name Surface area Region Notes Caspian Sea 371,000 square kilometres (143,244 sq mi) Atyrau Region, Mangystau Region The Caspian Sea is the world's largest enclosed body of water. Aike 64.7 square kilometres (25 sq mi) Aktobe Region Alakol 2,650 square kilometres (1,023 sq mi) Almaty Region Bird breeding and nesting ground Aral 17,160 square kilometres (6,626 sq mi) Shrinking owing to environmental problems[1] Azhibeksor SW of Lake Tengiz[2] Balkhash 16,996 square kilometres (6,562 sq mi) Almaty Region, Karagandy Region, Jambyl Region Bartogay Almaty Region Reservoir on the Chilik River Chagan Artificial lake (Former nuclear test site) Issyk 0.22 square kilometres (0 sq mi) Almaty Region Not to be confused with Issyk Kul Lake in Kyrgyzstan Jasybay 4 square kilometres (2 sq mi) Pavlodar Region Kayindi Almaty Region Kamyslybas 176 square kilometres (68 sq mi) Kapchagay also spelled Qapshaghay Bogeni Reservoir Kopa 14 square kilometres (5 sq mi) Akmola Region Markakol 455 square kilometres (176 sq mi) Sasykkol 600 square kilometres (232 sq mi) Almaty Region Surface can reach 736 square kilometres (284 sq mi) Tengiz 1,382 square kilometres (534 sq mi) Akmola Region Bird breeding and nesting ground Zaysan 1,810 square kilometres (699 sq mi) Zerenda 11.9 square kilometres (5 sq mi) Akmola Region Zhasylkol 1 square kilometre (0 sq mi) Almaty Region