2015 Map of Petit Bois Island

About this map

Gulf Islands National Seashore centers this coastal survey, highlighting the shifting sands and delicate geography of Petit Bois Island. This narrow barrier island stretches across the waters of the Gulf of Mexico, serving as a critical boundary between the open sea and the more sheltered Intracoastal Waterway to the north. The map documents the precise state-line border where Mississippi meets Alabama, cutting through the eastern tip of the island and the waters near Dauphin Island. This 2015 edition provides a high-resolution view of the shoals, inlets, and sandbars that define the Mississippi Sound's outer reaches, documenting the ever-changing littoral environment before further tidal erosion or storm-driven modification occurs.