The Maya homeland, called Mesoamerica, spans five countries: Mexico, Guatemala, Belize, Honduras, and El Salvador. There are now indications that the people we call the Maya had migrated from North America to the highlands of Guatemala perhaps as long ago as 2600 B.C., living an agricultural, village-based life. The culture of these Preclassic Maya owes much to the earlier civilization of the Olmec, which flourished ca. 1200 B.C.
By the time Maya civilization had reached its peak - the Classic
period (A.D. 200-900) - the Maya were spread across an almost continuous
territory of roughly 311,000 square kilometers (120,000 square miles), comprising
three general areas: 
The Rivers: A
series of rivers originates in the mountains and flows towards the Pacific
Ocean on the west coast, and towards the Gulf of Mexico in the southern
Petén lowlands. These rivers served as passageways for canoes to
travel from one city to another. Most of the Maya cities of the Classic
period were built near rivers that provided water for human consumption
and access to trade routes. In the northern Yucatán lowlands, however,
there are no major rivers.
The Rain Forest: Apart
from the volcanic glacier mountains, most of Mesoamerica is covered by a
dense rain forest. A rain forest resembles a greenhouse, providing warmth,
sunlight, and water, and producing an enormous variety of plants. Unlike
the rich humus soils of temperate-zone forests, the soil in rain forests
is thin and poor. In order to survive, tropical trees and plants have developed
highly efficient root systems that absorb nutrients from dead plants (which
decompose rapidly because of the high heat and humidity) before they are
washed away.
The Soil: The best soils are found in the southern highland valleys where volcanic eruptions have enriched the earth. The spring-like climate and fertile valleys made this a popular place to settle, despite the threat of volcanoes. Today, this area supports the largest Maya population.
(chart courtesy of MECC and Tom Duda)
While the Mayan-speaking peoples spread across
these regions shared many similarities, their geographical dispersal resulted
in the evolution of numerous languages which are related but sufficiently
distinctive to prevent different Maya groups today from understanding one
another. This divergence adds a further complication to efforts to translate
the hieroglyphic writing of the city-states. Scholars today are still trying
to reconstruct the family tree of the Mayan
languages and there are different interpretations, but it is generally
felt that four or five language groups had emerged by the Middle Preclassic
period (900-300 B.C.).
For further information
see also:
Central American
Cultural-Ecological Information Network