1. In the Underworld, there is a place called Tartarus, which is the place where Titans are sent to be punished.
2. There are 5 rivers in the underworld:
- Acheron - river of woe
- Phlegethon - river of fire
- Lethe - river of forgetfulness
- Styx - river of unbreakable oaths
- Cocytus - river of lamentation
3. A man named Charon has a responsibility of bringing souls across the rivers Styx and Acheron. Those are the only 2 rivers that he uses.