White Tank Mountain Regional Park. Nearly 30,000 acres makes this the largest regional park in Maricopa County. Most of the park is made up of the rugged and beautiful White Tank Mountains to the west of Phoenix. The range, deeply serrated with ridges and canyons, rises sharply from its base to peak at over 4,000 feet. Infrequent heavy rains cause flash floodwaters to plunge through the canyons and pour onto the plain. These torrential flows, pouring down chutes and dropping off ledges, have scoured out a series of depressions, or tanks, in the white granite rock below, thus giving the mountains their name. Thank you for visiting; and, for your comments and suggestions. Be sure to visit imaginature.us for links to other artists' galleries.