The surface of the country is also much broken up by short cross-ridges and detached peaks. There are numerous volcanoes, but only a few of them are more or less active. The more prominent are Orizaba (Citlaltepetl, “star mountain”), Popocatepetl (“smoking mountain”); Ixtaccihuatl (“white woman”); Nevada de Toluca, and Malinche.
On the Atlantic side the plateau descends abruptly to the narrow strip (about sixty miles) of gently sloping coast land; toward the Pacific, where the coast lands vary in width from forty to seventy miles, the descent is more gradual.
Rivers and Lakes.—From their rapid fall the rivers of such a mountainous region could never be of value for transport or communication. The Rio Grande del Norte, the boundary river, is only navigable for sixty miles up from the Gulf of Mexico, and the largest interior river—the Rio Grande de Santiago, flowing west to the Pacific—is barred across by many waterfalls, though its upper course expands to form Lake Chapála, the largest sheet of water in Mexico, fully fifty miles in length.
Climate and Landscape.—Though Mexico lies just on the border of the torrid zone, the climate is governed to a far greater extent by elevation than by position in latitude, and distinct climates are recognized at different stages just as in the plateau of Abyssinia.
The low coast land and the maritime region below an elevation of two thousand feet, called the Tierra Caliente, presents all the characteristics of tropical lands.
Above an elevation of two thousand feet, and up the slopes of the mountains to a height of about five thousand feet, a climate is found in which the landscape takes the aspect of that of the temperate zone.
This stage is known as the Tierra Templada.
NATIONAL PALACE, CITY OF MEXICO