The first reservoir built in Kyrgyzstan in 1956, Orto Tokoy, is located in Kochkor district in the Naryn province on the Chu River, at an altitude of 1700 meters. The length of the reservoir is 18 km, width 3-5 km, depth 47 meters, total surface area about 24 km2 and volume more than 4.7 billion m3 . The reservoir was built with the purpose of melioration of agricultural lands in Kyrgyzstan (86,000 hectares) and Kazakhstan (34,000 hectares).