Issyk-Kul is the largest lake in Kyrgyzstan, a drainless lake, one of the 25 largest lakes in the world by area and on the 7th place in the list of the deepest lakes. It is located in the North-Eastern part of the Republic, between the ridges of the Northern Tien Shan: Kungei Ala-Too and Terskei Ala-Too at an altitude of 1609 m above sea level.
The lake is drainless, with up to 80 relatively small tributaries flowing into it. Of these, the largest are the Tyup and Jergalan, which flow from the East. In the Western part of the lake is very close to the river Chu, which is on the channel Kutemaldy length of 6 km sometimes gives it part of its waters during spring floods. The water level in Issyk-Kul changes cyclically (it rises and falls); the cycle occurs over several decades. The water is brackish (water mineralization-5.90%).
The volume of water is 1738 km3, the area of the water mirror is 6236 km2, the length of the coastline is 688 km, the average depth is 278 m, the maximum depth is almost 2.5 times greater and equals 702 m. the Length of Issyk-Kul from West to East is 182 km, and from South to North — 58 km.