from the introduction:
The Elves of Ulthuan inhabit the great island-continent between the Old and the New World. They are commonly referred as High Elves to distinguish them from other elven peoples from which they were sundered long ago, namely the Dark Elves of Naggaroth and the Wood Elves of the Old World.

The name of High Elves is, not surprisingly, self-given: the Elves of Ulthuan hold themselves as the greatest, wisest and most noble of the Elf folks, which means of course the wisest and most noble of the peoples of the Known World. Yet even among the High Elves there is a distinction, often overlooked by outsiders and certainly not overly displayed by the High Elves themselves: there are, in fact, those that are considered “proper High Elves” and those that are dubbed as “Sea Elves”.

user note:
This supplement is edition neutral and contains no rules-oriented material.