| Category | Rivers |
| Continent | Brucrumus |
| Region | Clans, Troll Bogs |
| Map | Nulag River |
The Nulag river begins in the peaks of Khazandulud. It flows south through the valley of Irazaggumak into the mountains of Khizunul where it becomes rough rapids navigable only by canoe and small rafts. Once out of the mountains, the river becomes wider and slower. From the river towns and villages of the Hjalmarbrodd to the bay of Tarag-Khâlu, the depth is such that even giant-built ships can pass. The work of making deep channels comes from giant mud crabs called Ibelgas's Chariots.
Their meat a delicacy across many lands, they are true terrors to behold, shells that have been turned into shields as good as iron and the larger ones made into rune-carved tower domes resistant to both psionics and magic. Once shock units of Ibelgas, they now live as crustaceans should, naturally.
- Tipps, mud crab fisher, from the Tales of Tarag-Khâlu - "Soldiers to Dinner Table"
Numbers long checked by available food, Ibelgas's Chariots increased with with arrival of the Ark of Devgwer and its great beasts.