White Tank Mountain Regional Park is a gorgeous preserve of Sonoran Desert life that is considered by many locals to be the western boundary of the Phoenix metropolis. The park, covering nearly 30,000 acres, centers around the small but rugged White Tank Mountain range that is a haven for fragile desert flora and fauna. It features a diverse network of trails that offer experienced hikers plenty of adventure while also featuring plenty of more casual trails for those looking for a more laid-back visit.