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The entire area of Yell Sound and Sullom Voe and adjacent inlets within a line commencing at Ell Wick thence in a northerly direction along the line of low water mark on the west side to a point in latitude 60 38.27N, longitude 01 18.27W on the line of low water mark at the northern extremity of the Point of Fethaland, thence in an easterly direction following a straight line to a point in latitude 60 38.23N, longitude 01 11.13 W on the line of low water mark at the northern extremity of Fogla Lee on the island of Yell, thence generally in a southerly and easterly direction along the line of low water mark on the east side to a point in latitude 60 29.15N, longitude 01 05.80W on the line of low water mark at the south-eastern extremity of the Ness of Copister, thence in a southerly direction to a point in latitude 60 28.68N, longitude 01 05.97W on the line of low water mark at the south-eastern extremity of the Island of Orfasay, thence in a south-westerly direction following a straight line to a point in latitude 60 27.73N, longitude 01 08.37W on the line of low water mark at the southern extremity of Samphrey Island, thence in a westerly direction following a straight line to a point in latitude 60 27.75N, longitude 01 10W at the root of Mossbank Pier and thence generally in a northerly and southerly direction following the line of low water mark to the point of origin.