The Sierra Madre Mountains Spanning central Mexico from the Californian border in the northwest into Guatemala in the southeast, the Sierra Madre Mountains is easily Mexico’s largest mountain system. The Sierra Madre ranges from 1,500 to 3,500 meters above sea level — a combination of barren, snow-capped peaks and pine-oak forests that flourish in both arid and humid regions of the mountain range. The Sierra Madre is host to many endemic species of plants and wildlife, making it one of the most diverse ecosystems in the world.













