The San Xavier Indian Reservation (O'odham

O'odham language

O'odham is an Uto-Aztecan language of southern Arizona and northern Sonora where the Tohono O'odham and Pima reside. As of the year 2000, there were estimated to be approximately 9750 speakers in the United States and Mexico combined, although there may be more due to underreporting...

: Wa:k) is located near Tucson, Arizona

Tucson, Arizona

Tucson is a city in and the county seat of Pima County, Arizona, United States. The city is located 118 miles southeast of Phoenix and 60 miles north of the U.S.-Mexico border. The 2010 United States Census puts the city's population at 520,116 with a metropolitan area population at 1,020,200...

 in the Sonoran Desert

Sonoran Desert

The Sonoran Desert is a North American desert which straddles part of the United States-Mexico border and covers large parts of the U.S. states of Arizona and California and the northwest Mexican states of Sonora, Baja California, and Baja California Sur. It is one of the largest and hottest...

. It is the smaller eastern section of the Tohono O'odham Indian Reservation, the homeland of the tribe known as the Tohono O'odham

Tohono O'odham

The Tohono O'odham are a group of Native American people who reside primarily in the Sonoran Desert of the southeastern Arizona and northwest Mexico...

 Nation.
The San Xavier Reservation lies in the southwestern part of the Tucson metropolitan area

Metropolitan area

The term metropolitan area refers to a region consisting of a densely populated urban core and its less-populated surrounding territories, sharing industry, infrastructure, and housing. A metropolitan area usually encompasses multiple jurisdictions and municipalities: neighborhoods, townships,...

 and consists of 111.543 sq mi (288.895 km²) of land area, about 2.5 percent of the Tohono O'odham Reservation's territory.