The Salton Sea, a shallow inland lake south of Los Angeles, was created by tectonic forces along the San Andreas fault. It is lower than Death Valley and saltier than the Pacific Ocean. A remnant of the inland sea that covered southern California, it has dried up from time to time. It was last refilled by flooding of the Colorado River in 1907. The Hoover Dam was built to control such flooding. The Sea continues to get saltier, endangering its fish population.
Plagues and Pleasures of the Salton Sea (2004) covers the formation of the sea, its environmental issues, and the eccentric people in the area. A Christian nudist is interviewed.