The area of sea around the islands of Orkney below mean high water springs enclosed by a line extending from Point of Hisber on the mainland of Orkney at 59° 08' north and 3° 08' west; then north to a point at 59° 15' north and 3° 08' west; then east to a point on the west coast of Westray at 59° 15' north and 2° 52.5' west; then south east and north along the shoreline of Westray to a point on its east coast at 59° 15' north and 2° 50.1' west; then east to a point on the west coast of Sanday at 59° 15' north and 2° 38.3' west; then south, east and north along the shoreline of Sanday to a point on its east coast at 59° 15.4' north and 2° 30' west; then south to a point at 59° north and 2° 30' west; then west to the bay of Meil on the mainland of Orkney at 59° north and 2° 54.4' west; then west and north along the shoreline of the mainland of Orkney to the point of beginning.