The area of sea below high water springs enclosed by a line starting at a point on the East shore of the Orkney Mainland at 59° 00'N 2° 54.4'W; then East to a point at 59° 00'N 2° 30'W; then North to a point at 59° 4.6'N 2° 30'W; then West to Lamb Head on the island of Stronsay at 59° 4.6'N 2° 31.8'W; then West and North along the shore of Stronsay to Links Ness at 59° 09.1'N 2° 40.4'W; then West and South to a point on the South East coast of the island of Eday at 59° 08.6'N 2° 44.4'W; then along the South shore of Eday to War Ness at 59° 08.3'N 2° 47.1'W; then West to Point of Graand on the island of Egilsay at 59° 07.6'N 2° 55.2'W; then West and North to the Point of Avelshay on the island of Rousay at 59° 08.2'N 2° 57.8'W; then West along the South shore of Rousay to a point at 59° 08.2'N 3° 04'W; then South to a point on the Orkney Mainland at Aiker Ness at 59° 07.4'N 3° 04.4'W; then East and South along the shore of the Orkney Mainland to the start point.