What were New Sweden's boundaries in regards to present day Pennsylvania, Delaware, and New Jersey? How many square miles was it? And what current towns/cities in those present states are within the boundaries of the former colony?
New Sweden, as a colonial settlement, stretched along the Delaware River for about 70 miles, its broadest point about 35-40 miles at the month of the river; the precise borders are difficult to define as the colony consist of a number of small farms and homesteads, as well as Fort Christina (modern-day Wilmington) and a number of other military posts, rather than a clearly defended border. Indeed, by the time it was conquered by its colonial Dutch neighbours (1655), there were only about 300 Swedish men, women and children in the settlement. It included settlements that are now within the borders of Wilmington, DE, Salem, NJ, and land just to the southwest of modern day Philadelphia. The land claimed encompassed about 1300 sq. miles, but this was not a firm border.
Taylor, Alan, American Colonies, (New York: Penguin Books, 2001), pp. 254-55, 276.