Issyk-Kul (also Ysyk Köl, Issyk-Kol: ; ) is an endorheic lake in the northern Tian Shan mountains in eastern Kyrgyzstan. It is the tenth largest lake in the world by volume (though not in surface area), and the second largest saline lake after the Caspian Sea. Issyk-Kul means "warm lake" in the Kyrgyz language ( in Chinese texts); although it is surrounded by snow-capped peaks, it never freezes.

Issyk-Kul Region (Kyrgyz: Ысык-Көл областы) is one of the regions of Kyrgyzstan. Its capital is Karakol. It is surrounded by Almaty Region, Kazakhstan (north), Chuy Region (west), Naryn Region (southwest) and Xinjiang, China (southeast). It takes its name from Lake Issyk-Kul ("warm lake"), the second largest saline lake in the world, which never freezes despite its altitude in the Tian Shan mountains.