Also known as the River of Blood, it is known to have flowed through the Abyss and Baator before dumping its pollution into the Astral Sea. Some scholars theorize that it was opposingly related to the River Oceanus
Visitations:
- Pandesmos (Pandemonium)
- Orthrys (Carceri)
- Fugue Plane
- Lolth's City as a river of souls (Demonweb Pits)
- Fury's Heart (Deep Wilds)
- Nishrek
- Warriors' Rest
- Avernus and Stygia (Nine Hells)
- Plain of Infinite Portals (Abyss)
- Khalas (Gehenna)
- various locations of the Elemental Plane of Water