The Monongahela is a major river 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 eventually joins 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 scenic banks. The river's watershed supports diverse wildlife and ecosystems.