The St. Helena and Dependencies (Territorial Sea) Order 1989
This Order extends the boundaries of the Colony of St. Helena and its Dependencies so as to include, as territorial sea, the sea within twelve miles of the baselines of St. Helena, Ascension, Triston da Cunha, Gough Island, Nightingale Island and Inaccessible Island, together with its seabed and subsoil, and makes other provisions in this connection. In particular, it defines the baseline from which the breadth of the territorial sea is measured as generally the low water line, except where there are bays.