For more than a century, the southern edge of San Francisco Bay was reshaped by an industry that depended on keeping seawater out. Large stretches of tidal wetland were enclosed behind levees and converted into evaporation ponds, creating the distinctive geometric landscape of salt ponds visible across the South Bay.

For more than a century, industry transformed wetlands in the southern end of San Francisco Bay into colorful salt ponds. After decades of salt ponds replacing natural marshes,…

For more than a century, the southern edge of San Francisco Bay was reshaped by an industry that depended on keeping seawater out. Large stretches of tidal wetland were enclosed…