The Wabash River is a 503-mile-long (810 km) river that drains most of the state of Indiana in the United States.
It flows from the headwaters in Ohio, near the Indiana border, then southwest across northern Indiana turning south near the Illinois border, where the southern portion forms the Indiana-Illinois border before flowing into the Ohio River.
It is the largest northern tributary of the Ohio River and third largest overall, behind the Cumberland and Tennessee rivers.
From the dam near Huntington, Indiana, to its terminus at the Ohio River, the Wabash flows freely for 411 miles (661 km).
The Tippecanoe River, White River, Embarras River and Little Wabash River are major tributaries.
