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| | Imperial Valley 1973 to 1992 |
 | | This valley, also known as the Salton Sink, the Salton Basin, and the Salton Trough, is actually an extension of the Gulf of California, cut off from the Gulf by the Colorado River's delta fan. |
 | | The level of the Salton Sea is now sustained by an inflow of municipal and industrial drainage, as well as agricultural irrigation drainage, all of which flows through some of the old river beds that carried Colorado River overspill. |
 | | Daniel T. MacDougal, 1914, The Salton Sea; a study of the geography, the geology, the floristics, and the ecology of a desert basin: Washington, D. C., Carnegie Institution, 182 p. |
| www.nationalatlas.gov /articles/agriculture/a_ivalley.html (843 words) |
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