|Sierra Madre del Sur|
|Elevation||3,720 m (12,200 ft)|
|Length||1,000 km (620 mi) NW x SE|
|Area||143,447 km2 (55,385 sq mi)|
Sierra Madre del Sur, other major mountain ranges, and the Mexican Plateau
|States||Michoacan, Guerrero, Oaxaca|
The Sierra Madre del Sur joins with the Eje Volcánico Transversal (Trans-Mexican Volcanic Belt) of central Mexico in northern Oaxaca, but is separated from this range further west by the valley of the Río Balsas and its tributary the Río Tepalcatepec.
The mountains' highest point is Cerro Nube - 3,720 metres (12,200 ft), in southern Oaxaca, and just one major highway crosses the range between Acapulco and Mexico City.
Although separated from the main part of the Sierra Madre del Sur by the deep canyon of the lower Río Balsas, the mountains of southern Michoacán around Coalcomán are usually considered part of the Sierra Madre del Sur.
The Sierra Madre del Sur pine-oak forests ecoregion occupies the higher reaches of the range. These forests are part of a chain of Mesoamerican pine-oak forests that stretch from the Southwestern United States to Costa Rica along the American Cordillera.
Lower elevations of the range are covered by tropical dry forests, ecoregions in the Tropical and subtropical dry broadleaf forests Biome. The Jalisco dry forests occupy the western end of the range's Pacific slope. The Southern Pacific dry forests occupy most of the Pacific slope of the range, from Michoacan in the west through Guerrero and Oaxaca. The basin of the Balsas River, north of the Sierra, is home to the Balsas dry forests.