North Branch Raritan River

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The North Branch Raritan River is a tributary of the Raritan River in central New Jersey in the United States.

The North Branch Raritan River rises in central Morris County south of Dover and flows generally southward into Somerset County, around the southern end of the Watchung Mountains. At its end, it forms the border between Bridgewater and Branchburg Townships, and upon reaching the border of Hillsborough Township, joins the South Branch Raritan River to form the main Raritan River, which generally flows eastward from that point.

The river gives its name to the unincorporated village of North Branch, which lies on both sides of the river in Branchburg and Bridgewater Townships.