A geologically young system, the Andes were originally uplifted in the Cretaceous and Tertiary periods. They are still rising; volcanoes and earthquakes are common. The folded ranges are discontinuous—merging and bifurcating within the system—but as a whole they form one of the world's most important mountain masses. They are loftier than any other mountains except the Himalayas, with many snowcapped peaks more than 22,000 ft (6,700 m) high. Andean waters reach the Orinoco, the Amazon, and the Río de la Plata. 
The Andes are the world's longest mountain range, along the western coast of South America.