Isthmus Bay is a natural bay on the island of Newfoundland in the province of Newfoundland and Labrador, Canada. It is a sub-bay of St. George's Bay [1] and is flanked by the town of Port-au-Port. It is separated from Port au Port Bay by two narrow gravel isthmi. [2]
48°33′00″N58°42′54″W / 48.550°N 58.715°W