New Hampshire's Terrain: From Seacoast to the White Mountains

Three Physiographic Regions Define the Granite State

New Hampshire packs remarkable topographic diversity into 9,349 sq mi. The state divides into three distinct zones:

1. Seacoast Region (Southeast, ~18 mi coastline)

• Landforms: Sandy beaches (Hampton, Rye), salt marshes (Great Bay Estuary), rocky headlands (Odiorne Point), glacial drumlins.
• Elevation: 0–200 ft.
• Climate: Mildest in state; maritime moderation; avg Jan 22°F, Jul 70°F.
• Key towns: Portsmouth, Hampton, Exeter, Newmarket.

2. Merrimack Valley (South-Central)

• Drainage: Merrimack River (117 mi) + tributaries (Souhegan, Nashua, Piscataquog).
• Terrain: Rolling hills, broad intervals (floodplains), glacial lakebed flats (Lake Merrimack remnant).
• Elevation: 100–800 ft.
• Urban axis: Nashua – Manchester – Concord (capital) – Franklin — 80% of NH population.
• Climate: Transitional; warmer summers, colder winters than coast.

3. White Mountains Region (North & West, ~25% of state)

• Geology: White Mountain Batholith (Jurassic granite) + metamorphic cover — glaciated peaks, cirques, U-valleys.
• Peaks: **48 peaks ≥4,000 ft** (the "4,000-footers"); highest **Mount Washington 6,288 ft** (1,917 m) — highest in Northeast.
• Notable ranges: Presidential, Franconia, Carter-Moriah, Kinsman, Pilot, Sandwich.
• Features: Crawford Notch, Franconia Notch, Pinkham Notch, Flume Gorge, Lost River, numerous waterfalls.
• Climate: Subarctic at summit (avg Jan 5°F, Jul 49°F; 280" snow); alpine tundra above 4,500 ft.
• Recreation: White Mountain National Forest (750K acres), Appalachian Trail (160 mi in NH), skiing (10+ areas), hiking, leaf-peeping.

Elevation Gradient Effects

Other Regions

• Lakes Region (central): Winnipesaukee, Squam, Newfound — glacial basins, tourism hub.
• Dartmouth-Lake Sunapee (west-central): Connecticut River Valley, college towns (Hanover, Lebanon).
• Monadnock Region (southwest): Mount Monadnock (3,165 ft) — world's most climbed mountain.
• Great North Woods (far north): Spruce-fir forest, logging, snowmobiling, border with Maine/Quebec.

New Hampshire's terrain is **granite, glaciers, and gradient** — compact but complete.