The Navajo Nation (Navajo: Naabeehó Bináhásdzo) is a semi-autonomous Native American-governed territory covering 27,425 square miles (71,000 km2), occupying portions of northeastern Arizona, southeastern Utah, and northwestern New Mexico. It is the largest land area assigned primarily to a Native American jurisdiction within the United States.

The Nation has one of the largest and most involved North American tribal governments, with organic institutions that include a judicial system, and large law enforcement and social service agencies. Additionally, it is a major steward of public lands in the Southwest, and these lands encompass major natural sights such as Antelope Canyon, Shiprock and Monument Valley.

Situated within the Navajo Nation are Canyon de Chelly National Monument, Monument Valley, Rainbow Bridge National Monument, the Shiprock landmark, and a portion of Grand Canyon. The eastern portion of the reservation, in New Mexico, is popularly called the "Checkerboard" because Navajo lands are mingled with fee lands, owned by both Navajos and non-Navajos, and federal and state lands under various jurisdictions. Three large non-contiguous sections entirely surrounded by New Mexico are also under Navajo jurisdiction: the Ramah Navajo Indian Reservation, the Alamo Navajo Indian Reservation, and the Tohajiilee Indian Reservation.

The Tribal Trust lands have no private land ownerships, and all Tribal Trust land is owned in common and administered by the Nation's government. On the other hand, BIA Indian Allotment lands are privately owned by the heirs and generations of the original BIA Indian Allotee to whom it was issued. With Tribal Trust lands, leases are made both to customary land users (for homesites, grazing, and other uses) and organizations, which may include BIA and other federal agencies, churches and other religious organizations, as well as private or commercial businesses.

The Navajo Nation is divided into five agencies, with the seat of government located in Window Rock/Tségháhoodzání. These agencies are similar to provincial entities and match the five Bureau of Indian Affairs (BIA) agencies. The five agencies within the Navajo Indian Reservation are the Chinle Agency, Eastern Navajo Agency, Western Navajo Agency, Fort Defiance Agency, and Shiprock Agency. The BIA agencies provide various technical services under direction of the BIA's Navajo Area Office in Gallup, New Mexico. Agencies are further divided into Chapters, similar to counties, as the smallest political unit.

en.wikipedia.org/wiki/Navajo_Nation