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Arkansas is divided topographically into two major regions along a northeast-southwest trending “fall line”. This imaginary line divides resistant sedimentary Paleozoic rocks of the Interior Highlands from unconsolidated sediments of the Gulf Coastal Plain. Each region is further divided into five physiographic regions of Arkansas.
- Ozark Plateaus
- Arkansas River Valley
- Ouachita Mountains
- West Gulf Coastal Plain
- Mississippi River Alluvial Plain