Northeast megalopolis includes Portland.
The Northeast megalopolis -LRB- also Boston -- Washington Corridor or Bos-Wash Corridor -RRB- is the most heavily urbanized region of the United States , running primarily northeast to southwest from the northern suburbs of Boston , Massachusetts , to the southern suburbs of Washington , D.C. , in Northern Virginia .	Boston	Boston	urbanized region	Urban area	United States	United States	suburbs	suburbs	Massachusetts	Massachusetts	Northern Virginia	Northern Virginia	megalopolis	Megalopolis (city type)
It is in the Willamette Valley region of the Pacific Northwest , at the confluence of the Willamette and Columbia Rivers .	Willamette Valley	Willamette Valley	Pacific Northwest	Pacific Northwest	confluence	confluence	Willamette	Willamette River	Columbia	Columbia River
