The Monongahela River, located in Pennsylvania and West Virginia, is a major tributary to the Ohio River. This body of water has been given numerous nicknames and synonyms, such as the "Old Mon" or "Mon." It is also sometimes referred to as the "Mon River," "Monongy," or "Monga" by locals. The river's name itself is derived from the Native American term "Monongahela" which means "falling banks." In addition to being an important waterway for transportation and industry, the Monongahela River is also a popular destination for recreational activities such as fishing, boating, and kayaking.