This subject keeps coming up, that there is no central reference for tea shops, that I'm aware of.
I mentioned a few such references in a blog post about finding tea shops (the Reddit sub version, Tea Chat's, Steepster's), but none of those are remotely well populated or up to date. The links to them are in the post though, for what it's worth:
http://teaintheancientworld.blogspot.co ... r-you.html
Some guy made his own tea map, mentioned in a Steepster forum discussion, and the Google Maps format would work (or even his version), but it's still just some guy's version that anyone can make changes to:
https://steepster.com/discuss/25407-wor ... ap-project
You might wonder, where am I going with this? I'm not sure I would say that such a good central reference should exist, but it's odd to me that it doesn't. Tea Forum could start its own but I'm not sure how it would be any different than those other four.
Starting a link about tea shops in Vietnam reminded me of this. I ran across a thread about shop or source references in Thailand here while looking around just now. I guess that's how it has to be related to turning up good leads; someone would have to scan a dozen related sites and groups through searches.