Branch Back Brook is a small tributary of Back Brook in Hunterdon County, New Jersey, in the United States.

Branch Back Brook starts at 40°25′0″N 74°52′30″W / 40.41667°N 74.87500°W / 40.41667; -74.87500,[1] near the intersection of Route 202 and Route 179 by Lake Enterprises.

It flows northeast and crosses Route 31 before joining Back Brook at 40°25′24″N 74°51′45″W / 40.42333°N 74.86250°W / 40.42333; -74.86250.

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