. Comprehensive plan for the Illinois Nature Preserves System. Nature conservation; Wilderness areas. a BOTTOMLANDS SECTION The Bottomlands Section of the Wabash Border Division encompasses the bottomland forests, sloughs, marshes, and oxbow lakes in the flood- plains of the Wabash River, the Ohio River, and their major tributaries. Bottomland forests are the predominant vegetation with wet prairie and marsh associated with the sloughs. PRINCIPAL NATURAL FEATURES FOREST: Floodplain, terrace, swamp. PRAIRIE: Mesic, wet. MARSH TOPOGRAPHY: River floodplain, terrace de- posits, meander scars. AQUA
. Comprehensive plan for the Illinois Nature Preserves System. Nature conservation; Wilderness areas. a BOTTOMLANDS SECTION The Bottomlands Section of the Wabash Border Division encompasses the bottomland forests, sloughs, marshes, and oxbow lakes in the flood- plains of the Wabash River, the Ohio River, and their major tributaries. Bottomland forests are the predominant vegetation with wet prairie and marsh associated with the sloughs. PRINCIPAL NATURAL FEATURES FOREST: Floodplain, terrace, swamp. PRAIRIE: Mesic, wet. MARSH TOPOGRAPHY: River floodplain, terrace de- posits, meander scars. AQUATIC HABITATS: Oxbow lakes, sloughs, rivers. b SOUTHERN UPLANDS SECTION The Southern Uplands Section contains the dry and mesic upland forests on the deep loess bluffs along the Wabash River. The upland forests of white oak, sugar maple, beech, and sweetgum are the predominant plant community. Some sandstone ravines support an unusual combination of plant species that includes some relict northern species. PRINCIPAL NATURAL FEATURES FOREST: Dry upland, mesic upland, flood- plain. PRAIRIE: Mesic, dry. BEDROCK: Outcrops. TOPOGRAPHY: Dissected till plain, river bluffs, ravines. AQUATIC HABITATS: Creeks SPECIAL FEATURE: Relict northern plants. c VERMILION RIVER SECTION The Vermilion River Section is characterized by rugged topography and the beech - maple for- ests in the ravines along the Vermilion River and its tributaries. The beech - maple forests repre- sent an important climax deciduous forest type of the northeastern United States, which is found in Illinois only in the extreme eastern and southern portions. PRINCIPAL NATURAL FEATURES FOREST: Dry upland, mesic upland, flood- plain. PRAIRIE: Dry, mesic, TOPOGRAPHY: Dissected till plain, ravines, floodplain. AQUATIC HABITATS: Rivers, creeks. 11 OZARK DIVISION The Ozark Division consists of the Illinois part of the Salem Plateau of the Ozark uplift from northern Monroe County southward and includes the glaciated sandstone
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