(a) A line drawn from the seaward extremity of the Southwest Pass West Jetty located at coordinate latitude 28°54.5′ N., longitude 89°26.1′ W.; thence following the general trend of the seaward, highwater jetty and shoreline in a north, northeasterly direction to Old Tower latitude 28°58.8′ N., longitude 89°23.3′ W.; thence to westernmost point near Pass du Bois; thence to coordinate latitude 29°05.2′ N., longitude 89°24.3′ W.; thence a curved line following the general trend of the highwater shoreline to Point Au Fer Island except as otherwise described in this section.

(b) A line drawn across the seaward extremity of the Empire Waterway (Bayou Fontanelle) entrance jetties.

(c) An east-west line drawn from the westernmost extremity of Grand Terre Islands in the direction of 194° true to the Grand Isle Fishing Jetty Light.

(d) A line drawn between the seaward extremity of the Belle Pass Jetties.

(e) A line drawn from the westernmost extremity of the Timbalier Island to the easternmost extremity of Isles Dernieres.

(f) A south-north line drawn from Caillou Bay Light 13 across Caillou Boca.

(g) A line drawn 107° true from Caillou Bay Boat Landing Light across the entrances to Grand Bayou du Large and Bayou Grand Caillou.

(h) A line drawn on an axis of 103° true through Taylors Bayou Entrance Light 2 across the entrances to Jack Stout Bayou, Taylors Bayou, Pelican Pass, and Bayou de West.