The area of sea below mean high water springs enclosed by a line starting at a point on the west coast of South Ronaldsay at (58.82511°) 58°49'30" North latitude (−3°) 3° West longitude; then south, east and west along the shoreline to a point at (58.80002°) 58°48' North latitude (−3°) 3° West longitude; then north to a point on the west coast of South Ronaldsay at (58.80618°) 58°48'22" North latitude (−3°) 3° West longitude; then north, east and west along the shoreline to a point at (58.80717°) 58°48'26" North latitude (−3°) 3° West longitude; then north to the point of beginning.