Delaware Summer Day Camps

Delaware Geography

Twelve-Mile Circle, Wedge , Mason-Dixon line, and Transpeninsular Line "Counties" section below Map of Delaware The Twelve-Mile Circle Diagram of the Twelve-Mile Circle, the Mason-Dixon Line and "The Wedge". All blue and white areas are inside Delaware, except for the small sliver of Maryland on the western extremity of the circle. Delaware is 96 miles long and ranges from 9 miles to 35 miles across, totaling 1,954 square miles , making it the second-smallest state in the United States after Rhode Island. Delaware is bounded to the north by Pennsylvania; to the east by the Delaware River, Delaware Bay, New Jersey and the Atlantic Ocean; and to the west and south by Maryland. Small portions of Delaware are also situated on the eastern side of the Delaware River sharing land boundaries with New Jersey. The state of Delaware, together with the Eastern Shore counties of Maryland and two counties of Virginia, form the Delmarva Peninsula, which stretches down the Mid-Atlantic Coast. The definition of the northern boundary of the state is unusual. Most of the boundary between Delaware and Pennsylvania was originally defined by an arc extending 12 miles from the cupola of the courthouse in the city of New Castle. This boundary is often referred .