State of Mexico - Geography, Climate and Nature

Geography, Climate and Nature

The state is located in the center of the country, consisting mostly of the eastern side of the Anahuác Mesa. Most of the state consists of the Toluca Valley, with the eastern panhandle mostly defined by the Chalco Valley. The state has a territory of 22,499.95km2 and borders the states of Querétaro, Hidalgo, Guerrero, Morelos, Puebla, Tlaxcala and Michoacán. The state surrounds the Federal District of Mexico City on three sides (west, north and east).

The state is divided into five natural regions: the Volcanos of the Valley of Mexico, the hills and plains north of the state, the western mountains, the Balsas Depression and the mountains and valleys of the southeast.

The natural geography of the state varies. The eastern portion is dominated by the Sierra Nevada, which divides the state from Puebla. In this mountain chain are the Popocatépetl and Iztaccíhuatl volcanos. The Sierra de Monte Alto and Sierra de Monte Bajo divide the west side of the Federal District from the state and contain peaks such as Cerro de la Bufa and Monte de las Cruces. The Sierra de Xinantécatl is to the south of the Toluca Valley. At northern edge of this mountain range is the Nevado de Toluca volcano. In the northwest of the state is the Sierra de San Andrés Timilpan. Most of the rock and soil formation in the state is of volcanic origin.

There are three river basins in the state: the Lerma, the Balsas and the Pánuco. The most important is the Lerma River, which begins in the municipality of Almoloya del Río and passes through a large number of municipalities in the state. The southwestern part of the state is dominated by the Balsas River basin. The eastern panhandle of the state is dominated by the Pánuco River basin. On the various rivers of the state are dams such as José Antonio Alzate in Temoaya, Ignacio Ramirez in Almoloya, Guadalupe in Cuautitlán Izcalli, Madín in Naucalpan, Vicente Guerrero in Tlatlaya, Tepetitlan in San Felipe del Progreso as well as those in Valle del Bravo and Villa Victoria.

Lakes in the state include the Laguna del Sol and Laguna de la Luna in the Nevado de Toluca, the lake in the crater of the Cerro Gorde. Atexcapan Lake in Valle de Bravo, San Simón Lake in Donato Guerra, San Pedro Lake and Concepcion de los Baños Lake and Tepetitlan Lake in San Felipe del Progreso, Acuitzilapan Lake at the food of Jocotitlan Mountain, El Rodeo Lake near Xonacatlán, Xibojay and Santa Elena Lakes in Jilotepec and Huapango Lake in Timilpan.

About seventy percent of the state has a temperate moist climate, which consists of the highlands of the Toluca Valley and the areas around Texcoco in the north, the Toluca Valley and the areas around Texcoco. Average year-round temperature varies between 12C and 18C with annual precipitation above 700 millimeters. Higher elevations, about 13% of the state, in the center and east of the state have a semicold climate with average temperatures below 16C. Hotter climes are in the relative lowlands in the south west with have an average temperature of between 18C and 22C and constitute about eight percent of the territory. The hottest regions occupy five percent of the state in the extreme southwest with temperatures averaging over 22C. The coldest areas in the highest elevations such as the Nevado de Toluca, Popocatepetl and Iztaccihuatl. Snow can be found on these elevations year round. There are some arid areas along the borders of Hidalgo and Tlaxcala with annual precipitation between 500 and 700 milliliters.

Due to the various climates, the state has a wide variety of flora. 609,000 hectares is covered in tree, most of which is in the temperate and cold climates of the state. In the extreme southwest of the state, rainforests can be found and desert plants in the Hidalgo border area. In the highest altitudes, such as the peak of the Nevada de Toluca, alpine grassland can be found. In the extreme west, there are forests which receive thousands of monarch butterflies each winter.

The state has 49 environmentally protected areas, with the most important being the Nevado de Toluca National Park. Other important areas include the state parks of Otomi-Mazahua, Sierra Morelos and Nahuatlaca-Matlatzinca. The Bonsencheve National Park extends into Mexico State from Michoacán, and is one of the major monarch butterfly sanctuaries. At the far east is the Iztaccihual-Popocatepetl National Park which is shared with neighboring Puebla state.