The five Boroughs of New York City. Manhattan is the epicenter. The "Outer Boroughs" are The Bronx, Queens, Brooklyn and Staten Island. Three suburban-style shopping malls are located within the city's corporate limits; KINGS PLAZA (1), STATEN ISLAND MALL (2) and QUEENS CENTER (3). The initial IRT subway is indicated in black.

 Original map from Wikipedia

A map of the original IRT system appeared in the October 27, 1904 issue of The (New York) Evening Post.