The Sewers of Old Mournhold are a sprawling network of tunnels infested by Goblins, Durzog and Undead. The system is split into several sections:
- Bazaar Sewers — The sewer system beneath the Great Bazaar.
- Forgotten Sewer — The sewer system beneath Sadri Manor.
- Palace Sewers — The sewer system beneath the Palace Basement.
- Residential Sewers — The sewer system beneath Godsreach.
- Temple Sewers — An isolated sewer system accessible from the Temple Basement.
- West Sewers — A maze-like sewer system accessible from either the Palace or Residential Sewers.