That’s the mouth of the CT River on the left, emptying into the Long Island Sound. The Borough of Fenwick, a rather upscale part of Old Saybrook, stands in the middle distance, anchored by the Lynde Point Lighthouse, barely visible at its left edge.
I’m looking out over South Cove here, towards a dazzlingly bright late afternoon sun shimmering off the mud and water of low tide. Interestingly, there’s hardly any post-processing here; the camera’s color sensor rendered the scene in a simple monochrome.