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.

The origins of the state boundaries marked by the monument occurred just prior to, and during, the American Civil War, when the United States Congress acted to form governments in the area to combat the spread of slavery to the region. When the early territories were formed, their boundaries were designated along meridian and parallel lines. Beginning in the 1860s, these lines were surveyed and marked. These early surveys included some errors, but even so, the markers placed became the legal boundaries, superseding the written descriptions of geographical meridians and parallels. This includes the Four Corners Monument, which has been legally established as the corner of the four states.

The monument where “visitors can simultaneously straddle the territory of four states” is maintained as a tourist attraction by the Navajo Nation Parks and Recreation Department. Unlike many other attractions based on what are primarily political boundaries, such as the Berlin Wall, Four Corners Monument is an example of a political boundary that is a tourist destination in its own right. The monument consists of a granite disk embedded with a smaller bronze disk around the point, surrounded by smaller, appropriately located state seals and flags representing both the states and tribal nations of the area. Circling the point, starting from north, the disk reads with two words in each state “Here meet in freedom under God four states”. Around the monument, local Navajo and Ute artisans sell souvenirs and food. An admission fee is required to view and photograph the monument.[4] The monument is a popular tourist attraction despite its remote and isolated location. As early as 1908, people traveled long distances to take pictures of family and friends at the monument in Twister-like poses, sitting on the disk, in a circle of friends or family around the disk, or for couples to kiss directly over the disk.