The Four Corners region is in the red area on this map.

The Four Corners Monument, placed by the Interior Department at the exact point.

The Four Corners is the place in the Southwestern United States where the four corners of New Mexico, Colorado, Utah, and Arizona meet. Three of the four corners (AZ, NM, UT) are on the Navajo Indian Reservation and the fourth corner (CO) is on the Ute Mountain Indian Reservation.