The Ohio River is a major river in the United States, flowing approximately 981 miles. It begins at the confluence of the Allegheny and Monongahela Rivers in Pittsburgh, Pennsylvania, and it eventually empties into the Mississippi River at Cairo, Illinois. The river serves as a natural boundary between several states, including Ohio, Kentucky, and West Virginia. The Ohio River is an important waterway for transportation and commerce. It supports various industries, including shipping and fishing, and provides recreational opportunities such as boating and fishing. The river's watershed covers parts of 14 states, making it a vital resource for the region.