New York County topographic maps

Average elevation: 16 m

Average elevation: 8 m

Average elevation: 3 m

By the mid-1790s, increased military tensions renewed an interest in fortifying New York Harbor, and a U.S. congressional committee had drawn a map of possible locations for the First System of fortifications to protect major American urban centers. Governors Island was one of the first locations where…

Average elevation: 1 m