{{Short description|Stream in Sussex County, New Jersey}} {{Use American English|date=February 2025}} [[File:Flat Brook in Walpack Township New Jersey 400 yards north of mouth.jpg|thumb|right|300px|The Flatbrook in Walpack approximately 400 yards north of its mouth]]
'''Flat Brook''', also spelled as '''Flatbrook''', is an {{convert|11.6|mi|km|adj=mid|-long}}<ref name=NHD>U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. [http://viewer.nationalmap.gov/viewer/ The National Map] {{webarchive |url=https://web.archive.org/web/20120329155652/http://viewer.nationalmap.gov/viewer/ |date=2012-03-29 }}, accessed April 1, 2011</ref> [[tributary]] of the [[Delaware River]] in [[Sussex County, New Jersey|Sussex County]], [[New Jersey]] in the [[United States]].<ref name = "gertler">Gertler, Edward. ''Garden State Canoeing'', Seneca Press, 2002. {{ISBN|0-9605908-8-9}}</ref>
Upstream of the inflow of [[Little Flat Brook]], the brook is known as [[Big Flat Brook]].<ref name = "gertler"/>
Historically, the watershed of the Flat Brook, and its two main tributaries, the {{convert|12.7|mi}} Little Flat Brook and {{convert|16.5|mi}} Big Flat Brook, has been known as the ''[[Walpack Valley]]'' and is part of the historic [[Minisink|Minisink region]].
The [[Appalachian Trail]] passes through the watershed of the Flat Brook along Kittatinny Mountain.
The Flat Brook flows into the Delaware River near Walpack Bend in the [[Flatbrookville, New Jersey|Flatbrookville]] section of [[Walpack Township, New Jersey|Walpack Township]].
==Tributaries== * '''Flat Brook''' ** [[Tillman Brook]] ** [[Little Flat Brook]] *** [[Beerskill]] ** [[Big Flat Brook]] *** [[Criss Brook]] *** [[Forked Brook]] *** [[Normanock Brook]] *** [[Parker Brook]] *** [[Stony Brook (Flat Brook)|Stony Brook]]
==See also== *[[List of rivers of New Jersey]]
==References== {{Reflist}}
==External links== *[https://www.nps.gov/dewa/index.htm Delaware Water Gap National Recreation Area (National Park Service)] *[http://www.state.nj.us/dep/parksandforests/parks/stokes.html Stokes State Forest] *[https://waterdata.usgs.gov/nj/nwis/current/?type=flow U.S. Geological Survey: NJ stream gaging stations]
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{{Delaware Water Gap National Recreation Area}} {{authority control}}
[[Category:Rivers of New Jersey]] [[Category:Rivers of Sussex County, New Jersey]] [[Category:Tributaries of the Delaware River]]
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