Insar (Russian: Инса́р) is a river in the Mordovian republic of Russia. It is a right tributary of the Alatyr River. It is 168 km long, with a drainage basin of 3860 km². The river gets most of its water from melting snow, and hence its discharge is at its highest during the spring thaw. Average discharge at Saransk is 7,71 m³/s. The river freezes over in November, and is icebound until April.
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