The Whippany River is a tributary of the Rockaway River, approximately 20 mi (30 km) long, in northern New Jersey in the United States.
The Whippany River as seen from the Frelinghuysen Arboretum.
The Rockaway River is a tributary of the Passaic River, approximately 35 mi (56 km) long, in Morris County, New Jersey in the United States. The upper course of the river flows through a wooded mountainous valley, whereas the lower course flows through the populated New Jersey suburbs and former industrial area west of New York City. It drains an area of approximately 130 sq mi (340 km²).
Rockaway River in Denville
Morris Canal dam on the river at the start of the Boonton Gorge in Boonton
Piers of the former Denville Aqueduct for the Morris Canal over the river