| Category | Caverns |
| Continent | Brucrumus |
| Region | Drarthiel |
| Map | Ufthag |
The Houndaer Overpass encompasses a series of Underdark corridors that traverse the Green Nebulous. This passage is a segment of the Great Tradeway. In numerous sections, the overpass features yawning chasms plunging hundreds of feet to a mile at the most elevated points. In some areas, the chasms span the entire width of the passage. The trade routes, frequently monitored, possess bridges spanning these gaps.