(also Vysun’, Vulsun’, and Isun), a river in Nikolaev Oblast, Ukrainian SSR, a right tributary of the Ingulets River. It is 201 km long and has a basin area of 2,670 sq km. The Visun’ rises in the Dnieper Uplands and flows south through the Black Sea Lowland. It is fed primarily by snow. At times the river dries up in its upper and lower reaches. The Visun’ is used for water supply.