Sierra Madre del Sur

The Sierra Madre del Sur is a mountain range in southern Mexico, extending 1000 km from southern Michoacán east through Guerrero, to the Istmo de Tehuantepec in eastern Oaxaca. It joins with the Eje Volcánico Transversal 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 highest point is 3703 m, located at in central Guerrero.

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 range is noted for its very high biodiversity and large number of endemic species.