[4684499]

Excuse me, but where does the number 40M+ come from?

[baybal2]

Greater Beijing region may be?

[seanmcdirmid]

Greater BJ is just about 20 million.

[baybal2]

Greater BJ + nearby parts of Hubei?

[seanmcdirmid]

Beijing is a province in itself with a lot of countryside and satellite cities (chanping, miyun, etc...). It would be weird to include nearby surrounding hebei.

Perhaps they meant Beijing and Tianjin combined + Langfang and Zhangjiakou? That could be around 40 million. Jingjinji (Tiānjīn, Beijing, Hebei) is around 130 million, but that includes all of hebei.

[xiaopanga]

Hebei not Hubei

[seanmcdirmid]

Ah, I missed that. Ya, Hubei would have been a huge stretch, though you might be able to attach that to chongqing.