Dragonspear Castle was a fortress, built across three low hills on the southwestern edge of the High Moor, east of Trollbark Forest and just north of where the Coast Way joins the Trade Way. Extensive tunnels were dug under the keep, connecting with an underground river, the already-abandoned city of Kanaglym, and hence the larger Underdark. The Castle became most notable for its interplanar portals, through which come baatezu and other fiends.