| Rockaway River | |
|---|---|
 Rockaway River in Denville | |
 Map of the Passaic/Hackensack watershed | |
  | |
| Location | |
| Country | United States |
| State | New Jersey |
| County | Morris County |
| Physical characteristics | |
| Source | |
| • location | Oak Ridge |
| • coordinates | 41°01′52″N 74°28′21″W / 41.03111°N 74.47250°W |
| Mouth | Passaic River |
• location | Pine Brook |
• coordinates | 40°50′58″N 74°19′49″W / 40.84944°N 74.33028°W |
| Basin features | |
| River system | Passaic River |
| GNIS feature ID | 879755[1] |
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).