The Port of Hillsborough, on the west coast of Carriacou, takes in all the waters within a line from Craigston Point westward to the north side of Jack-a­-Dan Island and then west to the north side of Mabouya Island and then south to Cistern Point and then back along the foreshore to the starting point.
Hillsborough Bay (12°N, 61°28'W) is entered between Jack-a-Dan and Sandy Islet. A town stands at the head of the bay.