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Poston was the name most commonly used for the Colorado River War Relocation Center in western Arizona. As with Gila River to the east, Poston was built on Tribal land over the objections of the Colorado River Indian Tribes, who were unwilling to inflict on others injustices similar to what they had suffered in the past.
Like Manzanar, Poston began existence as an Assembly Center, called the Parker Dam Reception Center. Later converted to a permanent internment camp, Poston housed nearly 18,000 people from southern California and Arizona, making it the third largest city in the state after Phoenix and Tucson. At 71,000 acres (110 square miles), Poston was also the largest in area, comprising Poston I, II, and III, five miles apart from each other, and nicknamed "Roastin'," "Toastin'," and "Dustin'" by camp internees.