Arizona was the 48th state admitted to the United States and is part of the Southwest United States. It is one of the Four Corners states, south and east of the Colorado River, bordering New Mexico, Utah, Nevada, California and Mexico, and touching Colorado. It is also the name of a US Battleship, the USS Arizona. Its major cities are Phoenix, Tucson, Yuma, and Flagstaff. Besides the Grand Canyon, a number of other National Forests, Parks, Monuments, and Indian reservations are located in the state. Historians disagree about the origin of the name "Arizona" and its attachment to the region. Three possible derivations are: * O'odham words "ali on" ("small spring"), actually the name of a town which is called "Arizonac" in English. Arizonac is a small town about 12 km/eight miles south of the United States-Mexican border. Historically, it may have been "ali son" or even "ali sona". The O'odham "l" is a voiced alveolar lateral fricative, which might sound to a Spanish or English speaker like an "r" sound. Later in the mid 18th century Spanish missionaries changed Father Eusebio Francisco Kino's maps of the area; they renamed the town Arizonac as Arizona. As the maps were republished and circulated in Europe, the name Arizona became attached to the whole northern part of New Spain. * Spanish words "árida zona" ("arid zone") * Nahuatl word "arizuma" ("silver bearing"). In 1736, a small silver-mining camp called "Real Arissona" by the Spanish was established near Arizonac.