Sierra Madre mountains

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Sierra Madre Mountain range in Mexico, from the US border to se Mexico and extending s into Guatemala. It comprises the Sierra Madre Occidental, Sierra Madre Oriental, Sierra Madre del Sur, and the sub-range Sierra Madre del Guatemala. The ranges enclose the central Mexican plateau, and have long been a barrier to ew travel. The main range is 2400km (1500mi) long and c.16–480km (10–300mi) wide. The highest peak is Orizaba (Giltaltepetl) at 5700m (18,700ft).