New Hampshire is part of the New England region. It is bounded by Quebec, Canada to the north and northwest; Maine and the Atlantic Ocean to the east; Massachusetts to the south; and Vermont to the west.
The White Mountains range in New Hampshire spans the north-central portion of the state, with Mount Washington being the tallest in the northeastern U.S., and other mountains like Mount Madison and Mount Adams surrounding it. With hurricane-force winds every third day on the average, over 100 recorded deaths among visitors, and conspicuous krummholz (dwarf, matted trees much like a carpet of bonsai trees), the upper reaches of Mount Washington claim the title of having the "worst weather on earth.".
In the flatter southwest corner of New Hampshire, another feature, the prominent landmark and tourist attraction of Mount Monadnock, the second most climbed mountain in the world.
The Appalachian National Scenic Trail passes through New Hampshire.
Major rivers include the 110-mile (177-km) Merrimack River, which bisects the lower half of the state north-south and ends up in Newburyport, Massachusetts. Its major tributaries include the Contoocook River, Pemigewasset River, and Winnipesaukee River. The 410-mile (670-km) Connecticut River, which starts at New Hampshire's Connecticut Lakes and flows south to Connecticut, defines the western border with Vermont.
Oddly, the state border is not in the center of that river, as is usually the case, but lies at the low-water mark on the Vermont side; so New Hampshire actually owns the entire river where it runs adjacent to Vermont. The "northwesternmost headwaters" of the Connecticut also define the Canadian border with New Hampshire.
The Piscataqua River and its several tributaries form the state's only significant ocean port where they flow into the Atlantic at Portsmouth. The Salmon Falls River and the Piscataqua define the southern portion of the border with Maine. The state has an ongoing boundary dispute with Maine in the area of Portsmouth Harbor, with New Hampshire claiming dominion over several islands (now known as Seavey Island) that include the Portsmouth Naval Shipyard as well as to the Maine towns of Kittery and Berwick.
The largest lake is Lake Winnipesaukee, which covers 72 square miles (186 km) in the east-central part of New Hampshire.