Lower Manhattan is the southernmost part of the island of ManhattanManhattan is the most densely populated and the oldest of the five boroughs of New York City. Located primarily on the island of Manhattan at the mouth of the Hudson River, the borough is conterminous with New York County, an original county of the state of New York.
The New York County is the most densely populated county in the United States, and one of the most densely populated areas in the world, with a 2010 population of 1,585,873  living in a land area of 22.96 square miles (59.5 km2), or 69,464 residents per square mile (26,924/km²), more dense than any individual American city. It is also one of the wealthiest counties in the United States.
Manhattan has many famous landmarks, tourist attractions, museums, and universities. It is also the location of the United Nations Headquarters