The Colorado River.
Colorado
The river of Rhode Island is an argentine river
Ohio, Ohio River
Colorado
Mississippi.
rio grande
rio grande
The Rio Grande
Yes, it is a proper noun because Ohio River is the name of a specific river.
The Shenandoah River is on the east coast of the United States in Virginia and West Virginia.
· Tennessee River (United States) · Tigris River (Turkey, Iraq) · Tapajos River (Brazil) · Topol River (Russia) · Tippecanoe River (Indiana)