Above the city) on the north, and the Sierra Nevada with its snow-clad peaks of Popocatapetl and Ixtaccihuatl farther away to the south-east - and by a part of the Sierra de Ajusco, known as the Montes de las Cruces, from which the greater part of the city's water supply is derived.
Above sea-level, the Nevado de Toluca (15,168 ft.), in a range which separates the valleys of Mexico and Toluca, the Montes de las Cruces, and that volcanic, spur-like range, running northward at right angles to the axis of the other ranges, whose culminating points, some 20 m.
Thus, at Santa Fe, in the north central part of the state, the elevation is 7013 ft.; at Raton, in the N.E., 6400 ft.; at Las Cruces, in the extreme S., 3570 ft.; and at Red Bluff, in the extreme S.E., 2876 ft.
North-west to Cruces at the head of navigation on the Chagres River.
Mount Aguita is 20,600 ft., and the Bolivia culminating peak of those of Tres Cruces reaches 22,658 ft.
To the north of Tres Cruces is a transversal depression in the Cordillera, which is considered to be the southern termination of the high plateau of the Puna de Atacama.