Sierra Madre Oriental
Sierra Madre Oriental
Sierra Madre Oriental (literally: Eastern Sierra Madre)
Sierra Madre Oriental (literally: Eastern Sierra Madre)
the Rio Grande
The western border of Texas is formed primarily by the Rio Grande River. It separates Texas from Mexico.
my grades
It is called US-Mexico border. If you mean the name of the river that defines much of that border, it is called the Rio Grande river (or Rio Bravo del Norte in Mexico).
The Sierra Madre Occidental is the main mountain range of western Mexico.
Sierra Madre
Sierra Madre Occidental.
Rocky mountain