Cerro Nube Flane, Mountain summit in Oaxaca, Mexico

Cerro Nube Flane is a large mountain in the municipalities of San Pedro Mixtepec, San Juan Ozolotepec and Santo Domingo Ozolotepec, in southern Oaxaca, Mexico. Its summit reaches 3,784 meters above sea level, making it the highest peak in Oaxaca and the Sierra Madre del Sur, and Mexico's highest non-volcanic mountain. It has a prominence of 2,120 meters, qualifying as an ultra-prominent peak. The entire mountain is densely forested, with several endemic plant species.

The mountain appears in sources under several names: Nube Flan, Cerro el Nacimiento, and the Zapotec Quie Yelaag; in Nahuatl it is Mixtepētl, meaning 'hill of the clouds.' Its inaccessibility kept it little known, and its status as Oaxaca's highest peak rests on modern surveys rather than older assumptions.

The mountain carries several names: Nube Flan, Cerro el Nacimiento, the Zapotec Quie Yelaag and the Nahuatl Mixtepētl, meaning "hill of the clouds". Its remoteness in the Sierra Madre del Sur keeps it little known, and the villages of San Pedro Mixtepec, San Juan Ozolotepec and Santo Domingo Ozolotepec share its slopes.

Visitors should prepare for steep terrain and variable weather conditions, including high winds and sudden temperature drops, and require local guides familiar with the area for safe navigation through the complex environment.

The mountain is little known because of how hard it is to reach, and it appears under several names: Nube Flan, Cerro el Nacimiento, and the Zapotec Quie Yelaag. In Nahuatl it is Mixtepētl, "hill of the clouds", a name that matches the cloud cover implied by its Spanish name.