Jersey City is the second-most populous city in the U.S. state of New Jersey, after Newark. It is the seat of Hudson County as well as the county’s largest city. 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 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.