Quadripoint
The Four Corners Monument is the only point in the United States where four states meet: Colorado, Utah, New Mexico, and Arizona meet at right angles. The United States first acquired the area now called Four Corners from Mexico after 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. 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 monument is centered at .
Four Mile, New Jersey
Four Mile is an unincorporated community located within Woodland Township, in Burlington County, New Jersey, United States. The Four Mile Circle, where Route 70 and Route 72 intersect, is located in Four Mile, near the border of Pemberton and Southampton townships. Except for small businesses along Route 72 (such as gas stations, convenience stores, and taverns), a small residential cluster southeast of the circle, and the New Lisbon Developmental Center located about from the circle, the area is composed of forest (including the Brendan T. Byrne State Forest) that makes up the New Jersey Pine Barrens.