It is the northernmost of a series of volcanic ranges running the length of the eastern side of Baja California Sur. The rugged terrain makes access to the interior quite difficult, both for the inhabitants and for visiting researchers.
Many areas are accessible only by foot and by pack animals.
The small amount of scientific documentation that has been performed indicates that a sort of biological mosaic of species from both tropical and temperate climates exists in this area. The topography and habitats of these mountain ranges are quite varied and provide refugia for species from both north and south. In the past, when sea levels were higher and the surrounding low deserts were under water, these mountain ranges probably provided the only corridor for plant and animal dispersal along the peninsula. Adding to the appeal of the region, not only can many species' range extensions be found here, but many endemic species are present, and it is presumed that various new species may yet be discovered in this region. During the 1997 Lindblad Binational expedition to this area, San Diego Natural History Museum botanist Jon Rebman took some specimens of a large number of Brahea sp.