Consisting of numerous mountain peaks and ridges that extend from just over the border in the southwestern United States into Central Mexico, this ecoregion supports a vast array of plant and animal species; many of which are restricted to single peaks or ranges.
Among these species are some important wild relatives of agricultural crops, such as Agave (Agave spp.).
The Cape Region of the Baja California peninsula includes 3 extremely fragile and valuable ecoregions: Sierra de la Laguna dry forests, Sierra de la Laguna pine-oak forests, and San Lucan xeric scrub.