| River of Poison | |
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| Location | Third Earth |
| List of all locations | |
The River of Poison is body of water on Third Earth. The greenish yellow river flows through a dense forest and into Dismal Falls before emptying into the Baleful Swamp. The waters of the river are highly toxic, hence its name. It is always shrouded in a thick and deadly mist, resulting in poor visibility. It is a dark and dreary area and even the brave ThunderCats avoid venturing into the area and when they do, they wear the Thermal Catsuits to protect themselves from the harsh environment.