| Location on World Map | ||||
| Tree Gnome Stronghold | ||||
| ↑ | ||||
| Unknown | ← | Impassible Mountain Terrain | → | Ardougne |
| ↓ | ||||
| Unknown | ||||
The Impassable Mountain Terrain is a mountainous area of RuneScape Classic located west of Ardougne and south of the Tree Gnome Stronghold. Although players cannot traverse it overland, they must pass under it during the Underground Pass quest through the tunnels of the same name.
In RuneScape 3, the area includes the Galarpos Mountains and Arandar — a mountain pass which leads west to a region of elves known as Tirannwn.