1982 Map of Petit Bois Island

About this map

Petit Bois Island sits at the threshold of the deep gulf and the protected waters of the Mississippi Sound, as documented in this early 1980s topographical study. Part of the Gulf Islands National Seashore, the barrier island is shown with its intricate network of coastal marshes and low-lying terrain. The map captures the maritime infrastructure of the era, including the Horn Island Lighthouse and the northern channel of the Intracoastal Waterway Project Depth 12 Feet. Notable for its boundary details, the sheet marks the state line where Alabama meets Mississippi, as well as the county division between Mobile and Jackson counties. The survey reflects a landscape defined by shifting sands and navigational hazards, indicated by various piles and a secondary light guiding vessels through the passage between the sound and the open Gulf of Mexico.