 The bay measures approximately in width at its widest point between Bathurst and New Carlisle.The western end of the bay transitions into the estuary of the Restigouche River at Dalhousie, New Brunswick.The mouth of the bay is delineated by a line running from "Haut-fond Leander" near Grande-Rivière, Quebec in the north and the "Miscou Shoals" near Miscou Island, New Brunswick in the south.