where are the sierra madre oriental mountains located
Sierra Madre Oriental The Sierra Madre Oriental (Spanish  [ˈsjera ˈmaðɾe oɾjenˈtal] (help·info)) is a mountain range in northeastern Mexico. The Sierra Madre Oriental is part of the American Cordillera, a chain of mountain ranges (cordillera) that consists of an almost continuous sequence of mountain ranges that form the western "backbone" of North America, Central America, South America and Antarctica.