The Ancient Temenos was a cave in The Scorched Lands, within the simulation of the Underworld. It could be found in the northern part of the region, northeast of Salmoneus' Hubris. The cave featured a small prison build into the cave wall in the back.
During the Peloponnesian War, the misthios Kassandra explored the area, sealed two Tartaros Rifts and claimed some valuables. She went here in search of Phoibe, who tried to seek the help of the Keres but was abducted by the Cyclops of Kephallonia and his men.
- A temenos was an ancient Greek piece of land or location used in dedication to a god, as a sanctuary or sacred grove.