River, flowing westward across Indiana, U.S.

After crossing Indiana, the Wabash forms the 200-mi (320-km) southern section of the Indiana-Illinois boundary below Terre Haute, Ind. It empties into the Ohio River in southwestern Indiana after a course of 475 mi (764 km). During the 18th century the French used it as a transportation link between Louisiana and Quebec. After the War of 1812, its basin was rapidly developed by settlers. After the coming of the railroads in the 1850s, navigation almost disappeared except for barge traffic on its lower course.

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