In "The Dark Knight", more Chicago and New York influences were observed. On filming in Chicago, James McAllister, key location manager stated, "visually it's that look like you would see in the comic books." Nolan also stated "there's all these different boroughs, with rivers to interconnect. I think it's hard to get away from that, because Gotham is based on New York." In the movie, it is revealed that downtown Gotham, or much of the city, is on an island, similar to New York City's Manhattan Island, as suggested by the "Gotham Island Ferry". However, while Gordon is discussing evacuation plans with the Mayor, land routes to the east are mentioned. In conversation with Harvey Dent, Bruce Wayne indicates that the Palisades of the Wayne Manor estate are within the city limits. In terms of population, Lucius Fox says that the city houses "30 million people." The film indicates that the city's area code is 735, which in real life is an unused code. Compared to the previous film, less CGI was used in Gotham's skyline, resulting in plenty of shots of a digitally unaltered Chicago skyline.