New York City consists of five parts: Manhattan, Brooklyn, Queens, the Bronx and Staten Island. The population is about 7.5 million and there are 1.5 million in Manhattan alone. Manhattan, the center of the city, is on the island between the Hudson River and the East River. Most of the famous buildings such as the Empire State and the United Nations and other skyscrapers are in Manhattan. Some of its districts are: Broadway, which has many theatres and cinemas, Fifth Avenue, with stores and apartments, Greenwich Village, where many artists and writers have lived, and Central Park, with a skating rink  . From Manhattan you have to cross to the other parts of New York City through a tunnel or over a bridge. The bridge from Brooklyn to Staten Island is the longest in the world. New York is the second biggest port in the world and it has two airports. The people who live there come from all over the world and speak many different languages. There are 324,000 Germans and 390,000 Poles as well as people from Greece, Scotland, Ireland, Italy and Romania. People call one district "Little Italy" and another "China town". The most important part of New York is   _  .
Hudson River East River Bronx and Staten Island Manhattan