Wabash, river, c.475 mi (765 km) long, rising in Grand Lake, W Ohio, and flowing NW into Ind., then generally SW through Ind., becoming the Ind.-Ill. border before emptying into the Ohio River; largest northern tributary of the Ohio. The Wabash's major tributaries are the Tippecanoe and White rivers. Dams on the Wabash control floods, produce hydroelectricity, and regulate navigation; sand and gravel barges constitute the chief traffic on the river. In the fertile Wabash basin corn and livestock are raised. Vincennes , Terre Haute , and Lafayette , Ind. are on the Wabash.

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