Oak Bay is the northernmost section of Passamaquoddy Bay, into which the St. Croix River empties. Its extent fluctuates with the Bay of Fundy tidal changes, so that its northern section changes from approximately 30feet in depth at high tide to exposed ocean floor at low tide.[1] The rural community of Oak Bay lies on the shores of this embayment.[2] Located in the centre of the bay is Spoon Island, named so as it resembles an overturned spoon.