I’ve been making some maps for the alternate history HTTYD fic A Thing of Vikings (AO3 link here, TV Tropes page here) by, well, @athingofvikings. Here’s the map at the start of Book 1 (chapters 1-31):
While a lot of the details are educated guesses on my part, I’ve tried my best to keep most of this as historically accurate as I can. At the start of the fic the map changes are confined to this area:
Where aside from Berk, there’s also two other small dots, one in Lewis and Harris and one in Wales (between Deheubarth and Gwynned and Powys) corresponding to the Meatheads and Bog-Burglars respectively.
A few chapters into the start of Book 3, the map looks like this:
And looking at Europe specifically, the map looks like this:
It’s at this point that the map changes begin in earnest. (There are also a couple of maps I made in-between these two.) And yes, at 119 chapters this fic is long, but it is also a very well-written fic, so if you’re interested in checking it out I recommend it.