Manhattan is the oldest and the most densely populated of the five boroughs of New York City. Located primarily on the island of Manhattan at the mouth of the Hudson River, the boundaries of the borough are identical to those of New York County, an original county of the state of New York.

Manhattan is a major commercial, financial, and cultural center of both the United States and the world. Anchored by Wall Street in Lower Manhattan, New York City vies with the City of London as the financial capital of the world and is home of both the New York Stock Exchange and NASDAQ. Many major radio, television, and telecommunications companies in the United States are based here, as well as many news, magazine, book, and other media publishers.

Manhattan is home to many famous landmarks, tourist attractions, museums, and universities. It is also home to the United Nations Headquarters. It is the center of New York City and the New York metropolitan region, hosting the seat of city government and a large portion of the area’s employment, business, and entertainment activities. As a result, residents of New York City’s other boroughs such as Brooklyn and Queens often refer to a trip to Manhattan as “going to the city”, despite the comparable populations between those boroughs.

Information taken from Wikipedia