 Consequently, the Mississippi Alluvial Plain (or the Arkansas Delta) runs well into the city with Bayou Bartholomew picking up the western border as a line of demarcation between the Arkansas Delta and the Arkansas Timberlands.A series of levees and dams surrounds the area to provide for flood control and protect from channel shift.One of the world's longest individual levees at 380 miles runs from Pine Bluff to Venice, Louisiana.