Four Corners Monument
The Four Corners Monument marks the quadripoint in the Southwestern United States where the states of Arizona, Colorado, New Mexico, and Utah meet. It is the only point in the United States shared by four states, leading to the area being named the Four Corners region. The monument also marks the boundary between two semi-autonomous Native American governments, the Navajo Nation, which maintains the monument as a tourist attraction, and the Ute Mountain Ute Tribe Reservation.
Four continents
With the confirmed discovery that Australia was an island continent, the theme of the "Four Continents" lost much of its drive, long before a sixth continent, Antarctica, was discovered. The iconography survived as the Four Corners of the World, however, generally in self-consciously classicizing contexts: for instance, in New York, in front of the Beaux-Arts Alexander Hamilton U.S. Custom House (1907), four sculptural groups by Daniel Chester French symbolize the "Four Corners of the World."