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Dennys Bay is a bay in Washington County, Maine. Located between the towns of Pembroke, Dennysville, and Whiting, it extends roughly 5 mi. (8 km) from Dennysville to Cobscook Bay and is 2 mi. (3 km) at its widest.

Coordinates: 44°53′N 67°10′W / 44.89°N 67.16°W / 44.89; -67.16