The plains range is from the Mexican border with the United States to Cape Corrientes, about range of about half the western coast of Mexico, and includes Baja California.One physical feature of this region is that it has mountains bordering the ocean. There are more potentially active volcanoes in this region than in any other region in the Lower 48.
The Baja California Peninsula extends from the US-Mexico border to Cape Corrientes, covering roughly half of Mexico's western coast. A prominent aspect of this area is its mountainous terrain meeting the ocean. This region has a greater number of potentially active volcanoes than any other part of the Lower 48.