Uldhanesh

Uldhanesh is a human name for a mythical or semi-mythical homeland of the elves, said to be an island, an archipelago, or even a whole continent located far across the waters in the midst of the Encircling Ocean, thousands of miles from any known shore. The name originates in archaic Tuvai and means simply “Dwelling-place of the Elves,” from the roots "uldh-" (abode or dwelling place, cf. Ulthark, the Uldau, etc.), coupled with an old Tuvai term for the elves (aneshu or aiyenesh). The name Uldhanesh is used in both modern Tuvai and Chomarra; it dates back to ancient days when pre-Schism humans first came into contact with the Elder Race. It has survived mostly unchanged in both languages, and the myth of Uldhanesh is shared by human societies in Orithea and Achuirea. 
Scholars (as well as a handful of particularly worldly mariners) may associate the concept of Uldhanesh with the actual elven isles that lie far out in the Encircling Ocean. Those rare few sages with true knowledge of ancient elven lore may instead link it to Irlandare, the legendary lost homeland of the elvish race, said to have been destroyed before mankind was born upon the earth. To most people, though, Uldhanesh is simply the fabled land of the elves far across the sea, and they have no knowledge of either the real elven isles or lost Irlandare.
An alternate name for Uldhanesh is Ulthaeverin, which has the same basic meaning but is based on an alternate old Tuvai name for the elves, which is "aeverin." This name may in turn stem from that of the largest elven isle, Aevaron. This provides a further example of humans' confusion around the mythical concept of Uldhanesh, the real elven isles, the legend of lost Irlandare, and the elvish race itself in general.