Constituting part of the New York metropolitan area, Jersey City is bounded on the east by the Hudson River and Upper New York Bay and on the west by the Hackensack River and Newark Bay. A port of entry, with 30.7 miles (49.4 km) of waterfront and extensive rail infrastructure and connectivity, the city is an important transportation terminus and distribution and manufacturing center for the Port of New York and New Jersey. Jersey City shares significant mass transit connections with Manhattan. Redevelopment of the Jersey City waterfront has made the city one of the largest centers of banking and finance in the United States and has led to the district and city being nicknamed Wall Street West. In tandem, Jersey City has experienced extensive gentrification and has become one of the most expensive cities to live in the United States.