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 sq. km. and volume more than 4.7 billion m3 . The purpose of reservoir construction was the melioration of agricultural lands in Kyrgyzstan (86,000 hectares) and Kazakhstan (34,000 hectares).