The Rio Grande, with a length of 1,890 miles approximately and beginning in South-central Colorado of the U.S. is a river that marks the division between the American state of Texas and the Mexican states of <em>Chihuahua</em>, <em>Coahuila</em>, <em>Nuevo León</em>, and <em>Tamaulipas</em>. It's also part of the boundary between the U.S. states of New Mexico and Texas. Certainly, Rio Grande is a river that makes up some of the western borders of Texas.