Historically, the watershed of the Flat Brook, and its two main tributaries, the 12.7 miles (20.4 km) Little Flat Brook and 16.5 miles (26.6 km) Big Flat Brook, has been known as the Wallpack Valley and is part of the historic Minisink region.
The Appalachian Trail passes through the watershed of the Flat Brook along Kittatinny Mountain.
- Flat Brook
- Delaware Water Gap National Recreation Area (National Park Service)
- Stokes State Forest
- U.S. Geological Survey: NJ stream gaging stations
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