The Jordan Subbasin, as defined by the United States Geological Survey, is located entirely within Salt Lake and Davis counties in a roughly rectangular area of 791 square miles (2,050 km2). The Subbasin is part of the larger 3,830-square-mile (9,900 km2) Jordan River Basin that includes the upper Jordan River, Utah Lake, Provo and Spanish Fork Subbasins.[5][13] Four of the five largest cities in Utah are in Salt Lake County. The Jordan River flows through Sandy, with a 2008 population of 96,660; West Jordan, population 104,447; West Valley City, population 123,447; and Salt Lake City, population 181,698.[14] Flanked on either side by mountain ranges, the topography of the land varies greatly. The Wasatch Mountains rise on the east, with a high point of 11,100 feet (3,400 m) above sea level at Twin Peaks, near the town of Alta. The Oquirrh Mountains rise on the west, with a high point of over 9,000 feet (2,700 m) above sea level at Farnsworth Peak. The low point of 4,200 feet (1,300 m) is at the river's mouth, where the river enters the Great Salt Lake. Both the Oquirrh and Wasatch Mountains are fault-block mountains created from normal-slip faults where the mountains rise at the fault and the valley floor drops. The Wasatch Fault runs along the western edge of the Wasatch Mountains and the Oquirrh Fault runs along the eastern edge of the Oquirrh Mountains
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