[Edi]

Zen, I also like the Trueblood suggestion for Abysia, it fits with their theme.

Endoperez, Northmen would be a short and to the point description of Vanheim. It is a synonym for Vikings, which is what the Vanheim nation represents, and the term itself conjures images of Norse mythology.

C'tis already has Desert Tombs, which is the specific desert related theme (as opposed to the Nile delta related basic theme and Miasma), so it needs something else, not another desert-related tag.

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Another couple of good ones for Pangaea could be Wild Woods or Primal Forest.

Edi