Geology of Chile the Taitao Peninsula, the Peru–Chile Trench subduction zone is the boundary between the South American and Nazca Plates. At Taitao, the Chile Triple Junction and the Nazca Plate subduct the South American Plate. In Norte Grande the mountains form a series of plateaus, such as Puna de Atacama and the Altiplano. At a south latitude of 27 degrees, Chile's highest mountain (Ojos del Salado) reaches a height of . Below 42 degrees south, the Andes split into a fjord landscape and the highest mountain is Monte San Lorenzo at . As the mountains ebb, the snow line lowers; in the
Entiat Mountains stretch south to the Columbia River between the mouths of the Entiat and Wenatchee Rivers. The northern end the Entiat Range merges with the northern end of the Chelan Mountains. Most of the range is within Wenatchee National Forest. The northern end is part of the Glacier Peak Wilderness. The highest peak of the Entiat Mountains is Mount Fernow, at . Other major peaks include Seven Fingered Jack, Mount Maude, Copper Peak, Dumbell Mountain, Spectacle Buttes, and Buckskin Mountain. All these peaks are over and the three highest are over . They are all located in the northern part of