A description of the mountains, rivers, and lakes will help towards an understanding of the problems that are before us. The broad plateau, crossed by irregular ranges of mountains, that occupies the states of New Mexico and Arizona continues far south into Mexico. On the western rim the Sierra Madre lifts a great pine-covered barrier, beyond which the land drops off quickly into the hot fringe of coastal plain bordering the Pacific Ocean and the Gulf of California. The highest mountains of the western Sierra Madre are El Nevado and Colima, the first a snowy peak 14,370 feet high and the second an active volcano 12,278 feet high. On the eastern rim of the central plateau the second Sierra Madre is less continuous but it culminates in the loftiest peak of all Mexico—the wonderful cone of Orizaba. This mountain rises from the tropical jungles well into the region of perpetual snow and attains an elevation of 18,314 feet above the sea. Its name in Aztecan is Citlaltepetl, which means Star Mountain. Two other famous peaks of Mexico are Popocatepetl and Iztaccihuatl, both names being pure Aztecan. The first means Smoking Mountain and the second White Woman. These volcanic crests rise into the snowy zone from the table-land which is itself about 8,000 feet above the sea.
[Plate I.]
(a) Village Scene in Arid Mexico. Cactus and other thorny shrubs are ever present. The houses of the natives are of adobe with thatched roofs.
(b) In the Humid Lowlands. The view shows part of the plaza at Quirigua with one of the monuments almost concealed in vegetation of a few months’ growth.
Fig. 2. The Smoke reaches the Stars, a Mexican Picture of a Volcanic Eruption in the Codex Telleriano Remensis.
In southern Mexico the plateau area enclosed between the principal sierras narrows perceptibly, because the shore line of the Pacific and the mountain range that parallels it swing more and more towards the east. At the Isthmus of Tehuantepec a low valley separates the highland area of Mexico from that of Central America. This second table-land is not so wide as the one we have just considered and is more deeply dissected by rivers. The mountains of Guatemala rise to a considerable altitude, the highest being Tacaná with 13,976 feet elevation. Active volcanoes are numerous and earthquakes frequent and often disastrous. The Volcan de Agua and the Volcan de Fuego (Volcano of Water and Volcano of Fire) look down upon Ciudad Vieja and Antigua Guatemala, the old Spanish capitals which each in turn destroyed. The cordillera still presents its most abrupt front to the Pacific and on the eastern side, in Guatemala and Honduras, there are high forest-bearing ridges between the river systems. The Cockscomb Mountains in British Honduras are a low outlying group. In southern Nicaragua the main chain is broken by a low broad valley that extends from ocean to ocean. In Costa Rica and Panama a single range stretches midway along the narrow strip of land, with peaks that rise above 11,000 feet.
The lowland strip on the Pacific side of our area is a narrow fringe. Like the central plateau it is for the most part arid, but irrigation makes it productive. The lowlands of the Atlantic side are generally wet and heavily forested. The greatest land mass of uniformly low elevation is the Peninsula of Yucatan. In eastern Honduras and Nicaragua there are extensive river valleys of low elevation.