The Monongahela River is a major waterway in the United States, flowing through the states of West Virginia and Pennsylvania. It is approximately 130 miles long and is formed by the confluence of the Tygart Valley River and the West Fork River in Fairmont, West Virginia. The river flows northward, eventually joining the Allegheny River in Pittsburgh to form the Ohio River. The Monongahela River has played a significant role in the region's history, serving as a vital transportation route for goods and people. It is also known for its recreational opportunities, including fishing, boating, and hiking along its banks. The river's watershed supports diverse ecosystems and is important for local wildlife.