The area of sea below mean high water springs enclosed by a line starting from a point at 58°00'North latitude 8°00'West longitude; then east to a point at 58°00'North latitude 7°30'West longitude; then south to a point at 57°45'North latitude 7°30'West longitude; then west to a point at 57°45'North latitude 8°00'West longitude; then north to the point of the beginning.