| Category | Caverns |
| Continent | Brucrumus |
| Region | Drarthiel |
| Map | Ufthag |
The Houndaer Overpass is a stretch of Underdark passages that go over the Green Nebulous. This passage is part of Great Tradeway. In many areas of the passage there are gaping holes with drops of several hundred feet to a mile at the highest point. Some areas the holes span the width of a passage. Those in trade passages, which are often patrolled, have bridges spanning these gaps.