The Filthy River of Cocytus

AKA-
 * River of Ice
 * Gulf of Torment
 * Entryway to Gelum

The River of Ice is the open Entryway of Gelum. Spirits (Soes) or Sentients (Poes) that go here become tortured with regret, humiliation, and betrayal due to the River's Filth of Ice. The Deva Mother (Cytu) of Osia was named after this place for losing her purpose as a Holy Angel, and this is why Osia is struck with cold pettiness.