The Gateway Region is home to New Jersey's six largest municipalities: Newark, Jersey City, Paterson, Elizabeth, Woodbridge Township, and Edison. Major rivers and the bays include the Hudson River/Upper New York Bay, the Hackensack River and the Passaic River/Newark Bay, and the Raritan. The topography of the area is quite varied, with the Palisades and the Meadowlands in the northeast, the hills and valleys of the Watchung Mountains in the west, the Ramapo Mountains in the north, and tidal plains of the Raritan to the south. The confluence of the roads and railways of the Northeast Megalopolis make the region very heavily traveled. Chemical Coast is a nickname for the heavily industrial area along the Arthur Kill. Though there are broad distinctions between cities, suburbs, heavy industry, light manufacturing, recreational green spaces, nature preserves, and retail, transportation, and maritime infrastructure, the landscape is characterized by their close proximity to each other, as is typical of urban sprawl.