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 .
TAG Corner
TAG Corner (or simply TAG: Tennessee, Alabama, and Georgia) is a name for the region where the U.S. states of Tennessee, Alabama, and Georgia come together. It is a mountainous area dominated by the Cumberland Plateau and Lookout Mountain, with elevations ranging up to 2,000 feet/600 meters. The major routes of travel through the region are Interstate 59 and US 11, which follow a valley connecting Gadsden, Alabama in the southwest of the region with Chattanooga, Tennessee in the northeast.