All topographic features referred to below are according to the Gazetteer of Canada (Yukon Territory), Fifth Edition, Ottawa, 1988, and Canadian Hydrographic Service Charts 7661 (Demarcation Bay to Phillips Bay, 21st edition) and 7662 (Mackenzie Bay, 33rd edition), produced at a scale of 1:150,000 by the Department of Fisheries and Oceans at Ottawa.

A line following the ordinary low water mark of the northern coast of the mainland of the Yukon territory, except

(a) at any coastal indentation such as a bay, lagoon, arm, cove, basin or other inlet: a straight line across the entrance of the indentation at the ordinary low water mark, provided

(i) the line measures 4 kilometres or less, and

(ii) the area of the indentation, including any islands or parts of islands lying within the indentation, is greater than that of a semicircle whose diameter is the straight line;

(b) at Phillips Bay: a straight line from the most easterly point on the ordinary low water mark on the northwesterly extremity of the entrance of the said Bay near Stokes Point to the most northwesterly point on the ordinary low water mark on the northeasterly extremity of the entrance of the said Bay near Kay Point; and

(c) at Shoalwater Bay: a straight line from the most northeasterly point on the ordinary low water mark on the westerly extremity of the entrance of the said Bay to the most westerly point on the ordinary low water mark on the easterly extremity of the entrance of the said Bay.