Dulthapplas is a Deep Gnome settlement in the Underdark beneath Inis Olsang, near the surface settlement of Gultne in the Skyre Islands. It is one of the known population centers of the Deep Gnomes and lies within the subterranean systems beneath the islands.
Because Dulthapplas lies below the Spatial Break, ordinary long-range teleportation cannot directly connect it with locations on the surface. Travel between Dulthapplas and Inis Olsang therefore depends upon physical routes or the exceptional magical methods capable of crossing the Break.