The Highlands are made up of Piscataquis and Penobscot counties.
[2] This lack of a clear boundary in this area and further east in Maine, led to the Aroostook War, the only war ever declared by a U.S. state on a foreign country.
[3] "Maine Highlands" continued to be used to describe that portion of the border region running through the mountains at least until 1916.
[4] The Highlands lie within the New England-Acadian forests ecoregion.
This Maine state location article is a stub.