Interesting pictorial representation of clusters of matches.
Initially I thought that it would be great for figuring out more about those who do not have trees, or whose trees are private as they too are clustered.
However my enthusiasm dimmed when I examined my Southern England cluster (which I, but not my maternal cousin, has, which is a bit odd given he and I share that ancestry and the matches therefrom!)
Included in that cluster were two of my Paternal side matches, both of whom have been fully triangulated using GedMatch and belong firmly to my Scottish ancestry, one from the Scottish Borders, the other from my Stirlingshire/Perthshire ancestry which is rather unlikely to have come from Southern England.
One of these triangulated matches has two English places mentioned in their tree "England" and "Northumberland, England".
Which seems that their place search once they're beyond the DNA matching part of their algorithm and looking at the trees, is as good as when you search for matches with Somerset, England, eg, you also get all those that are just "England".
Another link I don't think anyone has mentioned:
https://cruwys.blogspot.co.nz/2017/03/ancestrydnas-new-genetic-communities.html
Lorna
http://LornaHen.com