The Sundering: Rise of the Witch King is a mod for Medieval 2: Kingdoms and based around the fantasy world of Game workshop's Warhammer universe during the civil war between the Elves, the mod's campaign opens with the Death of Bel Shanaar in -2751 IC.
Ulthuan is an island continent situated in the middle of the Great Ocean between the New World and Naggaroth and the Old World and Araby. Ulthuan is the home of the High Elves (and the ancestral home of all Elves by extension) and is in the form of a crescent, with a sheltered inner sea accessible only through the Straights of Lothern. It is divided into ten kingdoms, separated by the Anulii mountains into the Inner and Outer Kingdoms.
The map on this mod looks good :)