The fictional city protected by Batman in Christopher Nolan’s The Dark Knight is Gotham City.
Gotham is the primary setting for the film’s conflict between Batman, the police, organized crime, and the Joker. Its corruption and public fear are central to the story, as criminals and officials struggle over who controls the city’s future.
The name comes from Batman’s comic-book mythology and has been used in many screen adaptations. Nolan’s version presents Gotham as a modern American city with recognizable urban architecture, crowded streets, and a large police force.
Gotham City is not the same as Metropolis, the home of Superman. Blüdhaven is another DC Comics city associated with Nightwing, while Central City is most closely associated with the Flash.