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Hesperia is a city in the Mojave Desert, and the California Aqueduct traverses the area (Earth Metrics, 1989). Much of the native flora of Hesperia is classified as California desert vegetation, dominated by junipers, joshua trees and sagebrush. The elevation rises from 3,200 feet (980 m) in the north to about 4,000 feet (1,200 m) above sea level to the south. The San Andreas Fault, a major tectonic plate boundary of the Pacific and North American plates a few miles south of Hesperia in the Cajon Pass, has occasional seismic activity. Hesperia is located at 3,191 feet (973 m) above sea level and is a neighbor of Victorville, Oak Hills and Apple Valley. The Mojave River flows northerly through the east side of the city, while the California Aqueduct splits the city from north to south en route to Silverwood Lake. According to the United States Census Bureau, the city has a total area of 73.2 square miles (190 km2), with 73.1 square miles (189 km2) being land and 0.1 square miles (0.26 km2) (0.15%) being water.