Salt Ponds

A recent figure estimates that 80% of the San Francisco Bay wetlands area - approximately 16,500 acres - have been developed for salt mining. The ponds get their particular, vibrant colors from the micro-algae that live there and the species' tolerance to salinity. Areas that have a bright red hue are caused by the algae Dunaliella, which thrives in water with extremely high salt content. For a sense of scale, this Overview shows approximately one half of a square mile.

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