Pittsburgh River is a combination of two rivers, the Ohio and the Monongahela, which join together to form the Ohio River in Pittsburgh, Pennsylvania. The Ohio River is a 4-letter river that flows through the states of Ohio, West Virginia, Kentucky, Indiana, and Illinois. The Monongahela River is an 11-letter river that flows through Pennsylvania and West Virginia. Together, these two rivers form the Pittsburgh River, which is a major tributary of the Ohio River.