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POPSJamaca Bay Salt Marsh (NYC-area) Sinking Delightful and thoughtful blog with her photographs. Salt Marshes sinking for a number of reasons but like the delta below New Orleans and the Everglades swamps, the chief reason is our (humans) changing natural water, mineral and sediment/soil flows by building dams, highways, suburbs and watering lawns, as well as filling swimming pools and growing crops that use more water than natural flora.