Editing Mendham Borough, New Jersey (section)

==Geography==
According to the [[United States Census Bureau]], the borough had a total area of 5.98 square miles (15.49&nbsp;km<sup>2</sup>), including 5.93 square miles (15.36&nbsp;km<sup>2</sup>) of land and 0.05 square miles (0.13&nbsp;km<sup>2</sup>) of water (0.84%).<ref name=CensusArea/><ref name=GR1 />

Nestled on the northern end of the [[Somerset Hills]], the borough is completely surrounded by the larger [[Mendham Township, New Jersey|Mendham Township]] along with [[Bernardsville, New Jersey|Bernardsville]] in [[Somerset County, New Jersey|Somerset County]] to the south.<ref>[https://global.mapit.mysociety.org/area/1010476/touches.html Areas touching Mendham], MapIt. Accessed February 27, 2020.</ref><ref>[https://drive.google.com/file/d/0B5hiBO5NWHt5YzdlbHhiWnNWU2s/view Morris County Municipalities Map], [[Morris County, New Jersey]] Department of Planning and Preservation. Accessed February 27, 2020.</ref><ref>[https://www.state.nj.us/transportation/gis/maps/polnoroads.pdf New Jersey Municipal Boundaries], [[New Jersey Department of Transportation]]. Accessed November 15, 2019.</ref>

An unnamed pond in the borough is the source of the [[Passaic River]].<ref>[https://www.greatswamp.org/streams/passaic-river-headwaters/ Passaic River Headwaters], Great Swamp Watershed Association. Accessed July 3, 2018. "The Passaic River Headwaters is formed by the union of three tributaries, originating in Mendham Township, Mendham Borough, and Bernardsville.... The northernmost stem of the headwaters flows from Mendham High School and then through a mix of residential properties and protected land. "</ref> The [[North Branch Raritan River]] also originates in the borough.<ref name="raritanheadwaters.org"/>