N.H. Rev. Stat. § 22:4

The county of Belknap is bounded thus: Beginning at the easterly corner of Pittsfield; thence by the northerly lines of Pittsfield, Loudon, Canterbury, Northfield and Franklin to the westerly line of Sanbornton; thence by the westerly lines of Sanbornton and New Hampton to the southerly line of Ashland; thence by the southerly line of Ashland and Holderness to the westerly line of Center Harbor; thence by the westerly line of Center Harbor to the northerly corner of Center Harbor; thence by the northerly line of Center Harbor to the easterly termination of the line separating the towns of Center Harbor and Moultonborough; thence easterly to the southerly point of Long Island in Winnipesaukee lake; thence easterly to the southerly part of Parker's Island; thence easterly to the northwesterly end of Keniston's Island, sometimes called Baker's Island; thence along the southerly shore of said island to the easterly end of the same; thence to the westerly termination of the line separating the towns of Wolfeboro and Alton; thence on the northerly line of Alton to the northerly corner of New Durham; thence by the county of Strafford to the bound first mentioned.