The White Mountains occupy most of the northern one-third of the state. This natural region is the most rugged and heavily forested part of New Hampshire and contains some of the most magnificent mountain scenery in the eastern United States. The average elevation of the White Mountains in New Hampshire is from 760 to 1,200 m (2,500 to 4,000 ft). However, Mount Washington, in a part of the White Mountains called the Presidential Range, in north central New Hampshire, rises to 1,917 m (6,288 ft) and is the highest mountain in New England. Eight other mountains in the Presidential Range also have elevations of more than 1,500 m (5,000 ft). Deep glacial valleys, or gorges, are common in the White Mountains. Among the most famous of such valleys are Franconia Notch, Crawford Notch, and Tuckerman Ravine. That part of the White Mountains in the extreme northern New Hampshire is somewhat lower, with a maximum elevation of about 1,100 m (3,600 ft).

The New England Upland occupies most of central and southern New Hampshire. It is a hilly or rolling region with an average elevation of about 370 m (1,200 ft). However, a few isolated mountains rise to more than 900 m (3,000 ft) in the south. These mountains, which consist of rock that has resisted erosion more than the surrounding terrain, are called monadnocks, after Mount Monadnock, which was formed in this way in southern New Hampshire. The western edge of the New England Upland in New Hampshire includes the valley of the Connecticut River, a level plain 8 km (5 m) wide. The upland region in the state is also dotted with hundreds of lakes and streams, most of which were formed by glaciers.

The Seaboard Lowland covers the southeastern corner of the state. In this region the land slopes gently downward to the ocean from about 150 m (500 ft) near the New England Upland. The Seaboard Lowland is mostly level or gently rolling.

The Connecticut and Merrimack river systems drain most of the state. The Connecticut River rises in the Connecticut Lakes of northern New Hampshire and flows southward for 400 km (250 mi) along the Vermont-New Hampshire border before entering the state of Massachusetts. Its main tributaries in New Hampshire are the Israel, Ammonoosuc, Mascoma, Sugar, and Ashuelot rivers.

The Merrimack River is formed in central New Hampshire by the junction of the Pemigewasset and the Winnipesaukee rivers. The Merrimack’s largest tributaries are the Contoocook, Piscataquog, and Souhegan rivers, all of which enter from the west, and the Suncook River, which enters from the east. Other important rivers in New Hampshire are the Androscoggin and the Saco, which rise in northern New Hampshire and flow through Maine, and the Piscataqua and Salmon Falls rivers, which form part of the boundary between Maine and New Hampshire.

New Hampshire has more than 1,300 lakes and ponds. Its largest lake by far is the irregularly shaped Lake Winnipesaukee, in east central New Hampshire, which is 186 sq km (72 sq mi) in size. Other large natural lakes are Squam Lake, Newfound Lake, and Lake Sunapee.

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Official Website for the State of New Hampshire

The New Hampshire Gazette