Sol-Oltharë; meaning "Tower of the Moon" in elvish, was once a citadel of the Dark-Elves and is now a powerful military outpost of Morgoth.

This dark and fearsome castle was built by the Dark-Elves in the Second Age during their occupation of the eastern lands. It was later used by the kingdom of Adar, and is now used by Sorimmar’s armies. This fearsome castle was a sister fortress to Sol-Merazad, and is located north of the Grafenmyr, near the western banks of the Olgara River. This fortress guards the far northeastern regions of Morgoth and its border with the realm of Kurand.