The Prairie Dog Town Fork Red River is a river in the Texas Panhandle. It is the southernmost of two forks which meet to form the Red River, which flows east along the border of Oklahoma and Texas. The Texas Panhandle is a region of the state of Texas consisting of the northernmost 26 counties in the state. ... The Red River is one of several rivers with that name, and of two rivers with that name in the United States. ... Official language(s) None Capital Oklahoma City Largest city Oklahoma City Area Ranked 20th - Total 69,960 sq mi (181,196 km²) - Width 230 miles (370 km) - Length 298 miles (480 km) - % water 1. ... Official language(s) See: Languages of Texas Capital Austin Largest city Houston Area Ranked 2nd - Total 268,581 sq mi (695,622 km²) - Width 773 miles (1,244 km) - Length 790 miles (1,270 km) - % water 2. ...