The Holland Tunnel is a highway tunnel under the Hudson River carrying Interstate 78 on the island of Manhattan in New York City westward into Jersey City, New Jersey on the mainland of the United States. The New Jersey section also carries the NJ 139 designation. An integral conduit within the New York Metropolitan Area, the tunnel was originally known as the Hudson River Vehicular Tunnel or the Canal Street Tunnel; it was the first of two automobile tunnels built under the river, the other being the Lincoln Tunnel.