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The Pompton River is a tributary of the Passaic River, approximately 8 miles (13 km) long, in Passaic County in northern New Jersey in the United States.
It is formed south of the borough of Pompton Lakes by the confluence of the Ramapo and Pequannock rivers. It flows south, passing between Lincoln Park and Pequannock Township (to the west) and Wayne (to the east). It enters the Passaic north of Fairfield Township at an area called Two Bridges.
Its watershed encompasses a section of the Ramapo Mountains along the New York-New Jersey border in the rural suburbs of New York City. It is the main tributary by volume of the Passaic.
