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The Navajo Nation or Commonwealth of the Great Navajo Nation 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 in the United States. It is the largest land area retained by a U.S. tribe and is managed via agreements with the United States Congress as a sovereign Native-American nation.
The Columbia Group is a Washington, DC-based company in the Government sector.
North Peace Tribal Council is a High Level, AB-based company in the Government sector.
Lawton Water Treatment Plant is a Medicine Park, OK-based company in the Government sector.
The Department of the Interior (DOI) is the nation's principal conservation agency.