It is the westernmost region of the territory and borders the region of Cholla Springs to the northeast and the region of Río Bravo to the southeast. The San Luis River forms the southern border of the region, separating it from Nuevo Paraiso. This area of the game resembles southern California with its tan rocks, saguaro cactus, and Joshua trees.
This region being a hot desert, lot of Joshua trees and rugged rock formations making Gaptooth Ridge most likely resemble real-life Joshua Tree National Park in Southern California and other areas throughout Southern California and Nevada, such as the Mojave Desert.
"Gaptooth" may be a reference to the dental hygiene of the miners who inhabit the region. Many can be seen having "gaps" where they are missing a tooth or two.