Thread by @ArmsControlWonk

There are reports about a secret North Korean nuclear facility at a place called Bungang (분강). Here's the thing: Bungang (or more commonly Pun'gang) is just another name for the place we call Yongbyon. A short thread follows.
news.joins.com/article/234016…

Pun’gangni-nodongjagu or the Pun'gang-ni Workers District (39.806667, 125.743056) is what the North Koreans used to call the place where the Yongbyon Nuclear Complex is located. The town of Yongbyon is actually further away. (These places are all in Yongbyon County.)

While the North Koreans use "Yongbyon" today, you can see that early defectors used to call it Bungang or Pungang. It's the same place.
my-jia.com/KPA_Journal_In…

Of course, there may be other sites around Yongbyon. In 2009, Donga Ilbo quoted a South Korean official saying North Korea had a covert enrichment facility in Sowi-ri which is also nearby. So we should keep looking!
english.donga.com/List/3/all/26/…

And, of course, there are at least two massive underground shelters at Yongbyon that, once upon a time, raised Swedish eyebrows.
nytimes.com/1992/05/17/wor…

Reading the press on last DPRK WMD NIE carefully, the US believes North Korea has three HEU sites: Kangson, Yongbyon and one other. Given the care taken to avoid disclosing the location of the third site, I doubt it is at Yongbyon and I doubt Seoul has been told where it is.

PS: You can see a few seconds of the tunnels at Yongbyon here: