From Halopedia, the Halo wiki
Dur'at'dur is a group of islands on Sanghelios, the Sangheili homeworld. The islands were infamous for their deadly currents. In ancient Sangheili mythology, it was believed that the currents were caused by the endless thrashing of the nine serpents of Dur'at'dur, semi-mythical creatures that were slain by the demigod hero Kel 'Darsam.
List of appearances
- Halo: Shadow of Intent (First mentioned)
- Halo: Shadow of Intent, page 22 (Google Play edition)