The area of sea below mean high water springs enclosed by a line starting at a point at (58.5°) 58°30'North latitude (−7°) 7°West longitude; then east to a point at (58.5°) 58°30'North latitude ( 6.5°) 6°30'West longitude; then south to a point on the north coast of the Isle of Lewis at (58.39865°) 58°23'55"North latitude (−6.5°) 6°30'West longitude; then west and south along the shoreline including East Loch Roag to a point at (58.25°) 58°15'North latitude (−6.80424°) 6°48'15"West longitude; then west to a point on the east coast of Great Bernera at (58.25°) 58°15'North latitude ( 6.84232°) 6°50'32"West longitude; then north, west, and south along the shoreline to a point at (58.25°) 58°15'North latitude (−6.88829°) 6°53'18"West longitude; then west to a point at (58.25°) 58°15'North latitude (−7°) 7°West longitude; then north to the point of beginning.