The southern edge of the western highlands is marked by the Sierra Madre, which stretches from the Mexican border south and east, and continues at lower elevations toward El Salvador. The mountain chain is characterized by steep volcanic cones, including Tajumulco Volcano 4,220 m or 13,845 ft, the highest point in the country and Central America. All of Guatemala's 37 volcanoes (3 of them active: Pacaya, Santiaguito and Fuego), are in this mountain chain, and are abundant in the highlands.