<P> The Four Corners is a region of the United States consisting of the southwestern corner of Colorado, southeastern corner of Utah, northeastern corner of Arizona, and northwestern corner of New Mexico . The Four Corners area is named after the quadripoint at the intersection of approximately 37 ° north latitude with 109 ° 03' west longitude, where the boundaries of the four states meet, and are marked by the Four Corners Monument . It is the only location in the United States where four states meet . Most of the Four Corners region belongs to semi-autonomous Native American nations, the largest of which is the Navajo Nation, followed by Hopi, Ute, and Zuni tribal reserves and nations . The Four Corners region is part of a larger region known as the Colorado Plateau and is mostly rural, rugged, and arid . In addition to the monument, commonly visited areas within Four Corners include Monument Valley, Mesa Verde National Park, Chaco Canyon, and Canyon de Chelly National Monument . The most populous city in the Four Corners region is Farmington, New Mexico, followed by Durango, Colorado . </P> <P> The United States acquired the four corners region from Mexico after the end of the Mexican--American War in 1848 . In 1863 Congress created Arizona Territory from the western part of New Mexico Territory . The boundary was defined as a line running due south from the southwest corner of Colorado Territory, which had been created in 1861 . This was an unusual act of Congress, which almost always defined the boundaries of new territories as lines of latitude or longitude, or following rivers . By defining one boundary as starting at the corner of another Congress ensured the eventual creation of four states meeting at a point, regardless of the inevitable errors of boundary surveying . The area was first surveyed by the U.S. Government in 1868 as part of an effort to make Colorado Territory into a state, the first of the Four Corners states formed . The first marker was placed at the spot in 1912 . The first Navajo tribal government was established in 1923 to regulate an increasing number of oil exploration activities on Navajo land . </P>

What are the 4 corners of the united states