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August 06, 2022

Salt flats in San Francisco Bay, USA

© Jeffrey Lewis/Tandem Stills + Motio

A salty situation. San Francisco Bay salt flats

You might be wondering where the volcano is in today’s photo, but that’s not lava. These are salt evaporation ponds in San Francisco Bay. If you fly over this part of the USA, you’ll notice bright orange, green, blue and even magenta pools here. The vibrant colours are determined by brine shrimp, algae and other microorganisms and their responses to different levels of salt in the water. This orange results from mid-level salt and the presence of tiny brine shrimp in the water. Green indicates low levels of salt, while pink or red are signs of high salt content in an algae-rich pond.

When Spanish explorers and missionaries arrived in the area in the late 18th century, members of the Indigenous Ohlone people were already extracting salt from the naturally occurring ponds. The California Gold Rush (1848–1855) brought waves of settlers to the region, and salt became one of San Francisco’s largest industries.

Roughly 80% of the wetland was eventually lost to salt mining, landfill and industry. But since 2003, many of these tidal flats have been acquired by government agencies and private foundations, to be restored to their original state. The process will take decades but even as the wetlands are being restored, about half a million tonnes of sea salt are harvested from the ponds every year.

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