The Rahway River is a river in Essex, Middlesex, and Union Counties, New Jersey, United States, The Rahway, along with the Elizabeth River, Piles Creek, Passaic River, Morses Creek, the Fresh Kills River (in Staten Island), has its river mouth at the Arthur Kill. Part of the extended area of New York-New Jersey Harbor Estuary, draining part of the suburban and urbanized area of New Jersey west of Staten Island, New York, the river is approximately 24 miles (39 km) long. The upper reaches are lined with several parks while the mouth serves as an industrial access channel on the Chemical Coast.