Manhattan: The most densely populated and smallest of the five boroughs of New York City, consisting mainly of an island surrounded by the East River, Hudson River and Harlem River. It is home to many famous enterprises, known as the economic center of the world, is the richest district in New York, is described as the economic and cultural center of the entire United States, is the location of the CBD of New York City, the most concentrated area of skyscrapers in the world, It brings together the headquarters of most of the world's top 500 companies and is also the location of the United Nations Headquarters. Manhattan's Wall Street is the world's most important financial center, with the New York Stock Exchange and the Nasdaq. Manhattan is also one of the most densely populated places in the world, with 90 million tourists visiting New York City every year, making many attractions in Manhattan a world-renowned scene. Point.