The Arkansas Delta is one of the natural regions of the state of Arkansas. It runs along the eastern borer of the state next to the Mississippi River. It is part of the Mississippi embayment, itself part of the Mississippi River alluvial plain. The flat plain is bisected by Crowley's Ridge, a narrow band of rolling hills rising from 250 to 500 feet above the plain and on which many of the major towns lie. The region shares geographic and cultural similarities with the Mississippi Delta region on the other side of the river in Mississippi.