| Category | Rivers |
| Continent | Brucrumus |
| Region | High Wood Country, Great Expanse, Ice Cap |
| Map | Jhernarth River |
Jhernarth is a product of many waterways joining it along its long journey from the dark valley Emeldimir to the shores of lake Rumak. It is the longest west to east flowing river on Brucrumus. The river is named after the famed halfling explorer who navigated its length.
The river turns briny and acidic as it passes through Flux. This is a recent occurrence, beginning during the Chaos War when the strength of chaos emanating from Flux was at its peak.