The South Mountains known locally as simply South Mountain, is a mountain range in central Arizona in south Phoenix, Arizona. It is on public land managed by the city of Phoenix as South Mountain Park. Geologically, the South Mountains are thought to be a metamorphic core complex: evidence of movement of the North America tectonic plates from southwest to northeast and northeast to southwest, pushing up a series of mountain ranges including the South Mountains, which are some of the few remaining ones, the other ones having been covered up by silt (forming the current Phoenix metro area, which looks flat like a lake around mountains that kind of stick up over it like islands).
The underlying mountains are in the same orientation as the South Mountains, about one km high, and about one km apart from peak to peak, perhaps about 15 of them underneath the land. The mountain, along with the nearby Sierra Estrella, is considered sacred by the Akimel O'odham and the Kwevkepaya band of Yavapai. The South Mountain Preserve is part of the Phoenix Parks System and is the largest municipal park in the World. The preserve features recreational facilities such as ramadas, hiking and mountain biking trails, and equestrian facilities. The mountains overlook downtown Phoenix, AZ.