It forms the Illinois-Indiana border before draining into the Ohio River, of which it is the largest northern tributary. From the dam near Huntington, Indiana to its terminus at the Ohio River, the Wabash flows freely for 411 miles (661 km).
References
↑U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National MapArchived 2017-08-23 at the Wayback Machine, accessed May 13, 2011
Other websites
Media related to Wabash River at Wikimedia Commons