10 59 10 10 49 55 10 12 12 510 310 110 610 308 182 1 1 1 23 45 47 46 24 13 20 3134 90 90 90 90 190 190 BR 90 BR 90 LAKE PONTCHARTRAIN LAKE MAUREPAS LAKE BORGNE LAKE SALVADOR WHITE LAKE VERMILION BAY ATCHAFALAYA BAY BRETON SOUND CHANDELEUR SOUND TERREBONNE BAY CAILLOU BAY TIMBALIER BAY LITTLE LAKE BARATARIA BAY WEST COTE BLANCHE BAY EAST COTE BLANCHE BAY M I S S I S S I P P I S O U N D M i s s i s s i p p i R i v e r A t c h a f a l a y a R i v e r B a y o u Te c h e B a y o u L a f o u r c h e B a y o u L a fourche P e a r l Ri v er Ri v e r A m i t e R i v e r Ta n g i p a h o a LAKE VERRET LAC DES ALLEMANDS G u l f o f M e x i c o Gulf Islands National Seashore Eunice Crowley Opelousas New Iberia Donaldsonville Hammond Covington Mandeville Slidell Bay St Louis Gulfport Biloxi Picayune Plaquemine Lafayette New Orleans Baton Rouge Thibodaux Pointe a la Hache Golden Meadow Lafitte Houma Raceland Morgan City Franklin Venice Buras Grand Isle Mississippi River sediment plume Atchafalaya River sediment plume MISSISSIPPI LOUISIA N A Atchafalaya delta A growing “birdfoot” delta at Mississippi’s end reaches into the Gulf 0 0 25 Kilometers 25 Miles North Cities and towns Agriculture (formerly prairie and forest) Forest Swamp forest Marsh Acadian Cultural Center Prairie Acadian Cultural Center Wetlands Acadian Cultural Center Barataria Preserve French Quarter Visitor Center Chalmette Battlefield M i s s issip p i R i v e r New Orleans 1 1 2 2 3 3 4 4 5 5 LOUISIANA 3,500–2,500 years ago 2,600–1,500 years ago 1,500–700 years ago 1,200–500 years ago 500–present