It rises in the mountains of eastern Warren County, west of Hackettstown. It flows southwest, in a valley along the northwestern side of the Pohatcong Mountain ridge, which separates its watershed from that of the Musconetcong River. It joins the Delaware in Pohatcong Township, approximately 5 miles (8 kilometers) south of Phillipsburg.
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed April 1, 2011
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