Board Thread:Lore Discussion/@comment-25531876-20141229215535/@comment-15271256-20150107002537

I suppose if the Ayleids could have existed outside of Cyrodiil then the Falmer could have existed outside of Skyrim. And you do have a point, the Crypt of Hearts is a Dwemer Ruin with enterances in both Skyrim and High Rock, but it was left out of TESV. However, officially there are only Dwemer Ruins in Skyrim, Morrowind and Hammerfell, and we've never known Snow Elves to ever have been in Hammerfell or Morrowind (with the possible exception of Solstheim).