No Megalopolis Stretches from New Hampshire—The Northeast Megalopolis Is Boston–DC

The term "megalopolis" (popularized by Jean Gottmann, 1961) refers to the Northeast Megalopolis / BosWash corridor—the continuous urbanized zone from Boston, MA to Washington, DC (approx. 500 mi / 800 km).

It Does Not Start in New Hampshire

• Boston is the northern anchor.
• New Hampshire's southern tier (Nashua, Salem, Seacoast) is exurban/commuter fringe of Greater Boston—not the megalopolis core.
• No continuous urban fabric extends from NH to DC.

What NH Has Instead

• Manchester–Nashua metro (~420K) — distinct, not merged with Boston MSA.
• Seacoast (Portsmouth, Hampton) — historic ports, tourism.
• Lakes Region, White Mountains — rural/recreational.

Other world megalopolises: Tokyo–Nagoya–Osaka (Japan), Pearl River Delta (China), Rhine-Ruhr (Germany/Netherlands), São Paulo–Rio (Brazil).