The U.S. River or State term includes two solutions: Colorado (8 letters) and Ohio (4 letters). Colorado is a state located in the western United States, known for its mountainous terrain and diverse landscape. It is the 8th most populous state in the country and is home to the Rocky Mountains. Ohio is a state located in the Midwestern United States, known for its agricultural production and industrial heritage. It is the 7th most populous state in the country and is home to the Great Lakes.