Monongahela, << muh `non` guh HEE luh, >> River provides river transportation between the rich coal fields of southwestern Pennsylvania and the steel factories at Pittsburgh. The river is formed where the Tygart and West Fork rivers meet in Marion County, West Virginia. It winds northeast across the boundary of Pennsylvania to the mouth of the Cheat River. It unites with the Allegheny at Pittsburgh to form the Ohio River. The Monongahela is 128 miles (206 kilometers) long. Boats can sail on the river in Pennsylvania.
