depicted in the cartoon Darkwing Duck as sister cities connected by a bridge, very similar to Oakland and San Francisco. Gotham City (the home of Batman) and Metropolis (the home of Superman) have sometimes been presented as twin cities, mainly in 1970s and 1980s stories by DC Comics. In stories presenting them as twin cities, Gotham City and Metropolis are located on opposite sides of a large bay (identified as Delaware Bay in 1990's The Atlas of the DC Universe), with both cities linked by the Metro-Narrows Bridge, a suspension bridge resembling New York City's Verrazano-Narrows Bridge. Helium, from the Barsoom series of novels by Edgar Rice Burroughs, consists of the twin cities Greater Helium and Lesser Helium. See also List of divided cities Cross-border town naming Megacity List of metropolitan areas that overlap multiple countries Ecumenopolis Metropolis Megalopolis Sister city Notes References