River Cocytus

Cocytus, sometimes spelled Kokytos, is a river found in the Underworld. It is also known as "The River of Lamentation".

History
Cocytus flows into the river Acheron, across which is the underworld, the mythological abode of the dead. There are five rivers encircling Hades. The River Styx is perhaps the most famous; the other rivers are Phlegethon, Lethe, and Acheron.

Description
Cocytus was described as a river, flowing in a vast cavern in which the entire island of Manhattan could fit. Red clouds hung around in the air like vaporized blood. The landscape was rocky black plains, punctuated by jagged mountains and fiery chasms. The river itself was a ribbon of glittering, black liquid with a smell of sulfur. It also appears to have a mind of its own, trying to attack Percy Jackson and Annabeth Chase. Cocytus' water is freezing cold, filled with millions of heartbroken voices, as if the river were made of distilled sadness. If dipped in, the person's thoughts will become sad and miserable, having no purpose to live.

Trivia

 * Percy Jackson stated that the smell around Cocytus reminds him of his ex-stepfather, Smelly Gabe.