The Sierra de San Borja, also known as Sierra La Libertad, is a mountain range on the Baja California Peninsula of Mexico. It is one of the Peninsular Ranges which form the backbone of Baja California. The Sierra de San Borja is located between 28° North latitude and 29° North latitude. The highest point of the Sierra is Cerro La Sandia, 1,775 metres (5,823 ft) in elevation located at 28°24′25″N 113°26′18″W.