# The Petroleum (Production) (Seaward Areas) Regulations 1988, Paragraph 1


Except as provided by the four next following paragraphs, the lines dividing the mainland of Great Britain and islands adjacent thereto (other than the Orkney and Shetland Islands) and the waters adjacent to the mainland and such islands to be treated for the purposes of these Regulations as landward areas from the islands and waters to be treated for such purposes as seaward areas shall be the low water line along the coast of the mainland of Great Britain, the Isle of Wight, Anglesey and Holy Island.

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Source: https://www.legislation.gov.uk/uksi/1988/1213/schedule/1/paragraph/1 (the official version)
Page: https://openlegislation.uk/petroleum-production-seaward-areas-regulations-1988/schedule-1/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.