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That's an abandoned cranberry bog. The water's fresh, left behind by an overnight downpour. The cloud's are just clearing around the sunrise.
There are rules there against developing abandoned bogs. So those homes can keep their view. Behind me was another dune, and then the bay. So if you're sitting in that white house - you view the bog, the dune and Cape Cod Bay. Which is where, twelve hours or so after I took this snapshot, that same sun - set.