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. The tip of Mahar Point provides a fine view of the fierce whitewater created when Dennys Bay and Whiting Bay flow into Cobscook Bay. Pembroke - has a new launch ramp located at Leighton Point at the end of Leighton Road.