The mountain range immediately bordering the city on the east is known as the Sierra de Ramón, which was formed due to tectonic activity of the San Ramón Fault. This range reaches 3296 metres at Cerro de Ramón. The Sierra de Ramón represents the "Precordillera" of the Andes. further east is the even larger Cordillera of the Andes, which has mountains and volcanoes that exceed and on which some glaciers are present. The tallest is the Tupungato mountain at . Other mountains include Tupungatito, San José, and Maipo. Cerro El Plomo is the highest mountain visible from Santiago's urban area.