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Andes Mountains, mountain system of South America and one of the great natural features on Earth. The Andes consist of a vast series of extremely high plateaus surmounted by even higher peaks that form an unbroken rampart over a distance of some 5,500 miles (8,900 kilometers)—from the southern tip of South America to the continent’s northernmost coast on the Caribbean. They separate a narrow western coastal area from the rest of the continent, affecting deeply...