The Tosor (Kyrgyz: Тосор) is a river in Tong District and Jeti-Ögüz District of Issyk-Kul Region of Kyrgyzstan. It takes its rise on the north slopes of Teskey Ala-Too and falls into the lake Issyk-Kul. It is 30 kilometres (19 mi) long, and has a drainage basin of 304 square kilometres (117 sq mi). The river is fed by mixed sources of snow and glacier ice meltwater (85%) and rainfall (15%). Average annual discharge is 2.28 m/s, and during low water period from January to March - 1.0 m/s. The maximum flow is 65 m/s and the minimum - 0.4 m/s. The river is used for irrigation.