Mobile Bay, AL to the Chandeleur Islands, LA.
A line drawn across the inlets to Little Lagoon as an extension of the general trend of the shoreline.
A line drawn from Mobile Point Light to Dauphin Island Channel Light No. 1 to the eastern corner of Fort Gaines at Pelican Point.
A line drawn from the western-most extremity of Dauphin Island to the easternmost extremity of Petit Bois Island.
A line drawn from Horn Island Pass Entrance Range Front Light on Petit Bois Island to the easternmost extremity of Horn Island.
An east-west line (latitude 30°14.7′ N.) drawn between the westernmost extremity of Horn Island to the easternmost extremity of Ship Island.
A curved line drawn following the general trend of the seaward, highwater shoreline of Ship Island.
A line drawn from the Ship Island Light to Chandeleur Light; thence in a curved line following the general trend of the seaward, highwater shorelines of the Chandeleur Islands to the island at latitude 29°44.1′ N., longitude 88°53.0′ W.; thence to latitude 29°26.5′ N., longitude 88°55.6′ W.
[CGD 77-118a, 42 FR 35784, July 11, 1977. Redesignated by CGD 81-017, 46 FR 28154, May 26, 1981, as amended by CGD 84-091, 51 FR 7787, Mar. 6, 1986; CGD 89-068, 55 FR 31831, Aug. 6, 1990; 55 FR 33577, Aug. 14, 1990]