sentences:  Jurisdiction over rivers that form a border between states is usually determined by dividing the river down the middle between the states; this is not the case with the Delaware River.Delaware-New Jersey's curious border is the result of a grant by King Charles II in 1681, when the Delaware Colony was leased by William Penn from King Charles to become the three lower counties of Pennsylvania.The grant extended Delaware's northern border by The Twelve-Mile Circle in New Castle, Delaware, extending across the Delaware River.