That's certainly fiendish. I managed to scrape 2 points.
Not keen on the north and south groups. I'd only heard of 3 of them, and I expect most people would not do much better. Then there is the fact that there are so many things which it could be the northern or southern limit of. I'd be surprised if anyone ever got 10 on this one.

Brilliant as usual, diverse and clever

Clever and interesting.