Photo: Navajo Tours USA Four Corners is a region of the USA consisting of the southwestern corner of Colorado, southeastern corner of Utah, northeastern corner of Arizona, and northwestern corner of New Mexico. The most populous city in the Four Corners region is Farmington, New Mexico, followed by Durango, Colorado. Google Mapsgoo.gl/maps/HacuMxQCVwY41CSS6 Elsewhere on the … Continue reading Four Corners (USA)