The beachfront of Biloxi lies directly on the Mississippi Sound, with barrier islands scattered off the coast and into the Gulf of Mexico. Keesler Air Force Base lies within the city and is home to the 81st Training Wing and the 403rd Wing of the U.S. Air Force Reserve. In 1699, French colonists formed the first permanent, European settlement in French Louisiana, at Fort Maurepas, now in Ocean Springs, Mississippi, and referred to as "Old Biloxi". The settlement was under the direction of Pierre Le Moyne d'Iberville. La Louisiane was separated from Spanish Florida at the Perdido River near Pensacola (this was founded by the Spanish 1559 and again in 1698).