I'm guessing most of these groups were of japanes/chines persuasion.
We call them "crick cricks" as that's the sound the old cameras used to make (said with a japanes accent of course)![]()
All kinds of nationalities tbh, mostly Americans and British, some Chinese.
The places they were snapping and filming all have fantastic websites with dozens of beautiful photos ...
... but they obviously didn't want the photos for themselves, it was to put on social media so everyone could see them obscuring one beauty spot after another

