The Mohican River is a principal tributary of the Walhonding River, about 40 miles (64 km) long, in north-central Ohio in the United States. Via the Walhonding, Muskingum and Ohio Rivers, it is part of the watershed of the Mississippi River, draining an area of 999 square miles (2,587 km²).The Mohican River is formed in Ashland County, about 2 miles (3 km) southwest of Loudonville, by the confluence of the Black Fork and the Clear Fork.