Political divisions thumb|Sediment in motion at Ocean City, Maryland 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 tangential intersection with the Twelve-Mile Circle which forms Delaware's border with Pennsylvania. The border between Maryland and Virginia on the peninsula follows the Pocomoke River from the Chesapeake to a series of straight surveyed lines connecting the Pocomoke to the Atlantic Ocean.
political divisions thumb|sediment in motion at ocean city maryland 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 tangential intersection with the twelve-mile circle which forms delaware's border with pennsylvania the border between maryland and virginia on the peninsula follows the pocomoke river from the chesapeake to a series of straight surveyed lines connecting the pocomoke to the atlantic ocean