The northerly and southerly lines of towns adjoining Connecticut river are continued and extended across the river to the westerly line of the state, and the west line of the state is the western boundary of such towns.
N.H. Rev. Stat. Ann. § 51:1
On Connecticut River
Source
Official source: New Hampshire General Court. Reproduced from public-domain New Hampshire statutes; confirm against the official source for the current text. Not legal advice.