[jandrewrogers]

I think the consensus is that the Portland-Seattle-Vancouver corridor is the "real" megaregion of the PNW. That corridor has ~10 million people and a high per capita GDP, especially the middle part which kind of ties it together.

If you were going to include Spokane, it isn't that much of a stretch to include Boise as well.

[streb-lo]

Yea, that makes sense. I think you can conceivably define a megaregion to include places like the PNW corridor, the bay area, research triangle, etc. I'm just a bit baffled how Spokane and the region between makes the cut. Seems like the author just wanted to draw a bigger circle.