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LOUISIANA GEOGRAPHY – NOTES Chapter 2, Section 3 – Louisiana’s Natural Regions MISSISSIPPI FLOODPLAIN Floodplain – (level land along a river that is likely to flood) Alluvial soil – (fertile soil deposited by a river) Natural levee – riverbank built up over time by silt deposited by flooding Swamp – (a “seasonally flooded forest”) – lowest part of the river basin Passes – routes the Mississippi River takes to empty into the Gulf of Mexico This area is an estuary – (place where the river meets the sea), and is sometimes called the “birdsfoot delta” because of its shape. TERRACES REGION Contains the old Mississippi floodplains from when the river changed course Blufflands – old natural levees – highest part of the terraces Prairies – old river channels – flat and grassy Flatwoods – prairies with trees MARSH REGION Marsh – (a wet, treeless prairie covered with water and grasses) Transitional zone between the land and the ocean Saltwater marsh – closest to Gulf, water is brackish Freshwater marsh – further inland, has different plants Salt domes – (rock layers that have folded upward, rising above the surface) “Five Islands” – main salt domes that rise above the marsh Avery Island – famous for the Tabasco factory and Jungle Gardens RED RIVER VALLEY REGION Borders the Red River; smaller version of Mississippi Floodplain Fertile red soil comes from Oklahoma and Texas HILLS REGION Covers much of north Louisiana and the “toe of the boot” in the southeast Soil is poor for farming, but pine trees grow well there LA’s highest point – Driskill Mountain in Bienville Parish (535 ft. elevation)