Mahwah River

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The Mahwah River is a tributary of the Ramapo River in Rockland County, New York and Bergen County, New Jersey in the United States.

The Mahwah River runs on a meandering SSW course for about 11 mi (18 km) from its headwaters just north of the hamlet of Ladentown, New York to its mouth which empties into the Ramapo River in Mahwah, New Jersey, just south of the village of Suffern, New York, and the state line. Its course runs along the length of the Ramapo geologic fault on the eastern edge of Harriman State Park and below the face of the Ramapo Mountain escarpment. Numerous brooks and streams flowing out of the Ramapo Mountains to the west feed the river as it runs south. For most of its length the river's course is roughly paralleled by U.S. Route 202.