Southern Rocky Mountain Front

The Southern Rocky Mountain Front is a megaregion of the United States, otherwise known as a megalopolis, with population centers consisting mainly of the Front Range Urban Corridor and the Albuquerque–Santa Fe–Los Alamos combined statistical area, located along the eastern and southern face of the Southern Rocky Mountains in the U.S. states of Wyoming, Colorado, and New Mexico. The region comprises the southern portion of the Rocky Mountain Front geographic region of Canada and the United States, extending into the Southwestern United States.

Source: Wikipedia — Southern Rocky Mountain Front (CC BY-SA 4.0)