1
Geology and Formation: The Landslide Dam
Kel Suu was formed when a landslide—likely triggered by an earthquake in the 1980s—blocked the Kurumduk River in a narrow canyon of the Kokshaal-Too range, creating a natural dam and reservoir. The name "Kel Suu" means "incoming water" in Kyrgyz, a direct reference to the glacial melt that fills the lake. It sits at 3,514 m (11,529 ft) in the Kok-Kiya Valley, At-Bashi district, Naryn Oblast, along the Kokshaal-Too ridge of the Tian Shan range, within a few kilometers of the Chinese border.
The lake is 9 km long and between 500 m and 2 km wide. Its water is fresh with a turquoise-green color. The northern section is entirely enclosed by sheer cliffs rising hundreds of meters from the waterline, making it inaccessible on foot and visible only from the water. The surrounding peaks exceed 4,400 m and retain snow year-round. The lake has no fish—the water is too cold and too low in oxygen. Water levels are highly unpredictable: the lake partially drained in 2018, dropping several hundred meters before recovering. Locals note the lake has been known to drain completely in drought years.