Gulf Islands National Seashore’s 12 areas include historic forts, shaded picnic areas, nature trails, campgrounds, and island wilderness areas. From Cat Island, Mississippi, it stretches eastward 160 miles to the Okaloosa Area east of Fort Walton Beach, Florida. Sites in Mississippi include Cat Island, Davis Bayou, Horn Island, Petit Bois Island, Ship Island, and West Petit Bois Island.