The Salton Sea is 235 feet below sea level and is the largest lake in California, created accidentally in 1905 by an irrigation canal breach. It is also the most polluted lake in California with a very high salt content. It is an allegory for the world's environmental crisis but has a quiet serenity and beauty. It is fed by the new river an industrial sewage ditch that runs down across the border from Mexicali and the high phosphate irrigation waters of the imperial valley agricultural fields. It also sits onto of the largest geothermal fields in North American and is on the San Andres Fault. The danger of toxic dust spreading as far as Phoenix is a serious issue as the water levels drop in the lake.