What is the only NYC borough that isn't an island?
The Bronx — home to the Bronx Zoo, Yankee Stadium, and the city’s largest park, Pelham Bay Park — is the only borough that’s connected to the mainland. The other four are located on islands, surrounded by the city’s waterways, including the East River, the Hudson River, and the Long Island Sound. Brooklyn and Queens lie on Long Island, while Manhattan and Staten Island are on their respective self-named islands.
Source: Curbed