 The Arkansas Delta is a subregion of the Mississippi Alluvial Plain, which is a flat area consisting of rich, fertile sediment deposits from the Mississippi River between Louisiana and Illinois.According to the U.S. Census Bureau, the county has a total area of , of which is land and (1.2%) is water.Major hydrologic features include the Cache River, which roughly bisects the county north-south, Bayou De View, which runs through eastern Woodruff County, and the White River, which serves as the county's western boundary.