Guatemalan Highlands
The Guatemalan Highlands is an upland region in southern Guatemala, lying between the Sierra Madre de Chiapas to the south and the Petén lowlands to the north. The highlands lie above 1,000 feet and are made up of a series of high valleys enclosed by mountains and dominated by volcanoes that are both active and extinct. The local name for the region is Altos, meaning "highlands." The relief of the mountainous country which lies north of the Highlands and drains into the Atlantic is varied by terraces, ridges and underfalls; but its general configuration is compared by E. Reclus with the appearance of "a stormy sea breaking into parallel billows". A range called the Sierra de Chamá, strikes eastward towards Belize, and is connected by low hills with the Cockscomb Mountains. Another similar range, the Sierra de Santa Cruz, continues east to Cape Cocoli between the Polochic and the Sarstoon. A third, the Sierra de las Minas or, in its eastern portion, Sierra del Mico, stretches between the Polochic and the Motagua rivers. Between Honduras and Guatemala, the frontier is formed by the Sierra de Merendón. A few of the streams of the Pacific slope actually rise in the highlands, and force a way through the Sierra Madre at the bottom of deep ravines. One large river, the Chixoy or Salinas River, escapes northwards towards the Gulf of Mexico. In addition to the streams which break through to the Pacific, a number of larger streams which drain to the Gulf of Mexico or the Caribbean Sea have their sources in the highlands. The Motagua River, whose principal head stream is called the Rio Grande, has a course of about , and is navigable to within of Guatemala City, which is situated on one of its confluents, the Rio de las Vacas. It empties in the Gulf of Honduras, an arm of the Caribbean. Of similar importance is the Polochic River, which is about in length, and navigable about above the river-port of Telemán. A vast number of streams, among which are the Chixoy, Lacantún, and Ixcán, unite to form the Usumacinta River, which passes along the Mexican frontier, and flowing on through Chiapas and Tabasco, falls into the Bay of Campeche.