the main mountain system of Mexico, extending for 2500 km (1500 miles) southeast from the N border: consists of the Sierra Madre Oriental in the east, the Sierra Madre Occidental in the west, and the Sierra Madre del Sur in the south. Highest peak: Citlaltépetl, 5636 m (18 492 ft) (disputed)
Sierra Madre in American English
(siˈɛrə ˈmɑdreɪ; Spanish ˈsjɛʀɑ ˈmɑdʀɛ)
mountain system of Mexico, consisting of three ranges bordering the central plateau: highest peak, Orizaba