33 C.F.R. § 3.40-10
Sector Mobile's office is located in Mobile, AL. Subject to the overriding provisions of § 3.40-5 , the boundaries of Sector Mobile's Marine Inspection Zone and Captain of the Port Zone start near the Florida coast at latitude 30°05'45" N., 084°04'34" W. proceeding northerly along the boundary between Wakulla and Jefferson counties to position 30°15'00" N., 084°04'33" W.; thence west to latitude 30°15'00" N, longitude 84°45'00" W; thence north to a point near the southern bank of the Seminole Lake at latitude 30°45'57" N, longitude 84°45'00" W; thence northeast along the eastern bank of the Seminole Lake and north along the eastern bank of the Flint River to latitude 32°20'00" N, longitude 84°01'51" W; thence northwest to the intersection of the Georgia-Alabama border at latitude 32°53'00" N; thence north along the Georgia-Alabama border to the southern boundary of Dekalb County, AL, thence west along the northern boundaries of Cherokee, Etowah, Blount, Cullman, Winston, and Marion Counties, AL, to the Mississippi-Alabama border; thence north along the Mississippi-Alabama border to the southern boundary of Tishomingo County, MS, at the Mississippi-Tennessee border; thence west along the southern boundaries of Tishomingo and Prentiss Counties; thence north along the western boundaries of Prentiss and Alcorn Counties; thence west along the northern boundaries of Tippah, Benton, and Marshall Counties, MS; thence south and west along the eastern and southern boundaries of DeSoto, Tunica, Coahoma, Bolivar, and Washington Counties, MS; thence east along the northern boundary of Humphreys and Holmes Counties, MS; thence south along the eastern and southern boundaries of Holmes, Yazoo, Warren, Claiborne, Jefferson, Adams, and Wilkinson Counties, MS; thence east from the southernmost intersection of Wilkinson and Amite Counties, MS, to the west bank of the Pearl River; thence south along the west bank of the Pearl River to longitude 89°31'48" W (at the mouth of the river); thence south along longitude 89°31'48" W to latitude 30°10'00" N; thence east along latitude 30°10'00" N to longitude 89°10'00" W; thence southeast to latitude 29°00'00" N, longitude 88°00'00" W; thence south along longitude 88°00'00" W to the outermost extent of the EEZ; thence east along the outermost extent of the EEZ to the intersection with a line bearing 199°T from with a line bearing 199°T from 29°23'09" N., 084°04'34" W. to the EEZ (24°48'13" N., 085°50'05" W.); thence northeast to 29°23'09" N., 084°04'34" W."; thence due north to the Florida coast at longitude 084°04'34" W. (30°05'45" N., 084°04'34" W.).
33 C.F.R. §3.40-10