This was fairly quickly done, and not thoroughly checked, so there might be a ‘Popular Region’ missed out (probably other DM, or HB). Let me know if you know of another SOTA region with 700+ activations to date.
From a different perspective it could be said that DM/SX has 2698 activations of the 237 available summits, an average of just over 10 activations per summit.
Compare that to G/CE with 240 activations of the 5 available summits, an average of 48 activations per summit - surely a popular region!!