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Flat Brook in Walpack Township New Jersey 400 yards north of mouth
The Flatbrook in Walpack approximately 400 yards north of its mouth

Flatbrook is an 11.6-mile-long (18.7 km) tributary of the Delaware River in Sussex County, New Jersey in the United States.

Upstream of the inflow of Little Flatbrook, the brook is known as Big Flatbrook.

Historically, the watershed of the Flatbrook, and its two main tributaries, the 12.7 miles (20.4 km) Little Flatbrook and 16.5 miles (26.6 km) Big Flatbrook, has been known as the Walpack Valley and is part of the historic Minisink region.

The Appalachian Trail passes through the watershed of the Flatbrook along Kittatinny Mountain.

The Flat Brook flows into the Delaware River near Walpack Bend in the Flatbrookville section of Walpack Township.


  • Flat Brook
    • Tillman Brook
    • Little Flat Brook
      • Beerskill
    • Big Flat Brook
      • Criss Brook
      • Forked Brook
      • Normanock Brook
      • Parker Brook
      • Stony Brook
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