 Most of the land is rural, and there are only a few large population centers.It has been suggested that Delmarva residents have a variation of Southern American English which is particularly prevalent in rural areas.The border between Maryland and Delaware, which resulted from the 80-year-long Penn–Calvert Boundary Dispute, consists of the east-west Transpeninsular Line and the perpendicular north-south portion of the Mason–Dixon line extending north to just beyond its tangental intersection with the Twelve-Mile Circle which forms Delaware's border with Pennsylvania.