Nelmthyr is the capital of Naalthyr. It is located in the south west of Nehonore. It is constructed of a dark grey and black stone and is where Caenith, Queen of Naalthyr, holds court.

Nelmthyr was constructed uncounted millennia ago with its tall tower-keep located at the centre. The Citadel is surrounded by tall thick walls, the only entrance to which is via the road leading over the river. It is unnaturally corrupted, and stands out as a blackened wound in the jungles of Nehonore.