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The State of Arizona comprises the extreme south-western portion of the United States. It is bounded on the north by Utah, on the east by New Mexico, on the south by Mexico, and on the west by California and Nevada.

Because of the low rain and high heat, the desert floor is baked to a thick crust that has difficulty absorbing water. This makes drainage difficult, and causes flash floods. When rains start, especially heavy rains during the monsoon, it is typical for a completely dry area to become flooded in a matter of minutes.