The Rio Grande
The Rio Grande forms part of the US border with Mexico, while the St. Lawrence River forms part of the border between the US and Canada.
The Limpopo forms that border between Zimbabwe and South Africa.
The highest elevation in Texas is found in the Guadalupe Mountains, located in the western part of the state near the border with New Mexico. The highest point in Texas is Guadalupe Peak, which stands at 8,751 feet (2,667 meters) above sea level.
Columbia
Haiti is the western part of the Caribbean island Hispaniola, to the East is Dominican Republic, to the West is borders the Caribbean Sea. Further to the west is the Island of Cuba
The Rio Grande river is the river that is on the western border of Texas.
California's eastern border and Arizona's western border.
Laos!
Sabine River
The Sabine River.
Quebec, Canada
Sabine River
Lake Texoma
The Red River.
Yes, the Rio Grande River is in Texas and forms a part of the border between Texas and Mexico.
The physical feature that forms Uruguay's western boundary with Argentina is the Uruguay River. It also forms part of the Brazilian-Argentine border.
The Red River.