It is Dona Ana County.
its on of the borders of Texas and Mexico
The Rio Grande is the border between Mexico and Texas.
Cimarron County, OK. It borders Colorado, Kansas, New Mexico, and Texas.
The southern border of Texas is the Rio Grande River. The river is owned by both the United States and Mexico.
The Rio Grande (known as Rio Bravo in Mexico)
A short stretch of the Rio Grande River serves as the boundary between Texas and New Mexico.
The Rio Grande, Red and Sabine rivers and the Gulf of Mexico.
The Sabine River separates the lower half of Texas from Louisiana.
The Rio Grande is the border between mexico and texas
The Rio Grande is between Texas and Mexico; the Red River (Mississippi Watershed) is between Texas, Oklahama, and Arkansas; and the Sabine River is between Texas and Louisiana.
Rio Grande (Mexico), Red River (Arkansas, Oklahoma), Sabine River (Louisiana)
Mexico is the only country that borders Texas.