The Jamandavan () is a river in Toguz-Toro District, Naryn Region, Kyrgyzstan. It is a right tributary of the Ala-Buga.
The river is long and has a drainage basin of . It originates on the northern slope of the Jaman-Too range. In its upper reaches, it is known as Syrtkashka-Suu. After its confluence with the Tuura-Suu, it is called Jamandavan and flows northward through a narrow valley.
In its middle and lower reaches, the valley widens and becomes marshy. The average annual discharge is . The highest flow occurs in June and July, while the lowest flow is observed in February and March. The river has high water from April to September and low water from October to March.
The Jamandavan is mainly fed by snow, glaciers and springs. Its waters are used for irrigation.
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