pennsylvania and delaware
In most cases the eastern boundary of something will touch the western boundary of the next door something. Where "something" can be a state, province, country, estate, ocean, lake river, Earth plate etc.
the country that forms the northern boundary of the United States is Canada :)
Norway, Finland, and Russia were creating a northern boundary.
Canada.
Northern Touch was created in 1997.
The northern boundary of Sumatra is a general tectonic boundary where the Eurasian Plate meets the Sunda Plate. This boundary can experience earthquakes and volcanic activity due to tectonic movements.
It is in the northern hemisphere and also the western hemisphere.
Pennsylvania.
Kentucky forms most of the northern border of Tennessee.
The northern boundary of British Columbia is located at approximately 60 degrees latitude.
Maryland's northern boundary is defined by the Mason-Dixon Line, which serves as the border between Maryland and Pennsylvania.