Vermont's Northeastern Bulge, Vermont

The entirety of the state line between Vermont and New Hampshire is the Connecticut River, with one exception, at the 45^th parallel. Here, the river curves to the east, 1/3^rd of a mile south of the point that is the intersection of Halls Stream and the 45^th parallel, which was established as the international boundary point in the 18^th century, officially where the “northwesternmost head of the Connecticut River meets the 45^th parallel.” However, the river meanders eastward for another two miles past its confluence with Halls Stream, before curving north and finally crossing the 45^th parallel. This creates a two mile sliver of Vermont that is surrounded by New Hampshire on three sides, capped by a two mile stretch of the 45^th Parallel, serving  as a state boundary. A granite monument from 1934, next to the river at the 45^th parallel, sets in stone the line between Canaan, Vermont, and Pittsburg, New Hampshire, and declares the northeast corner of Vermont to be a point in the river that is 314 feet east from the center of the monument.