Phoenix, Arizona, the largest city in the State and sixth largest in the U.S. is located in the Arizona Sonora Desert. There is nothing more iconic of the desert than the stately Saguaro cactus. This cactus garden also has two varieties of Prickly Pear cactus. There is a palo verde tree in full bloom with its yellow flowers in the background. This Cactus Garden is in the Gilbert Riparian Preserve at Water Ranch, Gilbert, Arizona USA