The San Francisco Bay-Delta Estuary is a partially enclosed, tidally influenced body of water where fresh water from interior rivers meets the salty water of the Pacific Ocean. Because of this unique interaction of geography and water chemistry, a highly productive ecosystem that included 542,000 acres of historic tidal wetlands once flourished. By the 1980s all but 26,000 acres had been destroyed.
An effort is underway to restore 100,000 acres of San Francisco Bay's historic wetlands. Robin Grossinger of the San Francisco Estuary Institute has mapped the lost marshlands of San Francisco Bay. Phil Williams is a preeminent wetlands scientist.They discuss the origins and fate of Bay marshes in this video.
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