Gotham City is the home of Batman, just as Metropolis is home to Superman, and the two heroes often work together in both cities. In comic book depictions, the exact distance between Gotham and Metropolis has varied over the years, with the cities usually being within driving distance of each other. The two cities are sometimes portrayed as twin cities on opposite sides of the Delaware Bay, with Gotham in New Jersey and Metropolis in Delaware. "The Atlas of the DC Universe" from the 1990s places Metropolis in Delaware and Gotham City in New Jersey.