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a river in Gorky Oblast, RSFSR, a right tributary of the Volga. Length, 144 km; basin area, 2,200 sq km. The river is fed primarily by snow. Its average discharge at a point 54 km from its mouth is 5.75 cu m per sec; the greatest discharge is 236 cu m per sec and the lowest is 0.21 cu m per sec. There are sanatoriums and rest homes on the Kud’ma.