Editing Port Jervis, New York (section)

===State line monuments===
{{main|Tri-States Monument}}
[[File:NJ-NY-PA Tri-States and Witness Monuments - looking southwest.jpg|thumb|left|upright=1.2|Overlooking the [[Tri-States Monument]] at the confluence of the Delaware and Neversink rivers from the Witness Monument]]
Port Jervis lies near the points where the states of [[New York (state)|New York]], [[New Jersey]] and [[Pennsylvania]] come together. South of the Laurel Grove Cemetery, under the viaduct for Interstate 84, are two monuments marking the boundaries between the three states.<ref name=njgs>{{cite web |url=http://www.njgeology.org/enviroed/newsletter/v2n2.pdf |title= Sentinels at the Northern Border |first=Bill |last=Graff |work= Unearthing New Jersey Vol. 2, No. 2 | date=Summer 2006 |publisher=New Jersey Geological Survey}}</ref>

The larger monument is a granite pillar inscribed "Witness Monument". It is not on any boundary itself, but instead is a witness for two boundary points. On the north side (New York), it references the corner boundary point between New York and Pennsylvania that is located in the center of the Delaware River {{Convert|475|ft|m}} due west of the Tri-State Rock. On the south side (New Jersey), it references the Tri-State Rock {{Convert|72.25|ft|m}} to the south.

The smaller monument, the [[Tri-States Monument]], also known as the Tri-State Rock, marks both the northwest end of the New Jersey and New York boundary and the north end of the New Jersey and Pennsylvania boundary.<ref name=ccv>{{cite book|first1=C. Clarkson |last1=Vermeule|author-link=Cornelius Clarkson Vermeule I |editor1-last=Cook |editor1-first=George H. |editor-link=George Hammell Cook |title=Final Report of the State Geologist|chapter=Physical Description of New Jersey: Northern Boundary Between New Jersey and New York |date=1888 |pages=66–67 |chapter-url=https://books.google.com/books?id=n1oMAAAAYAAJ&pg=PA66|publisher=Geological Survey of New Jersey|location=Trenton, New Jersey |volume=1}}</ref> It is a small granite block with inscribed lines marking the boundaries of the three states and a bronze [[United States Coast and Geodetic Survey]] marker.<ref>{{cite web |title=LY2604: TRI STATES |url=https://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=LY2604 |publisher=[[U.S. National Geodetic Survey]]}}</ref> Both monuments were erected in 1882.<ref name=njgs/>