In Greek mythology, the "River Styx" (Greek: Στύξ also meaning hate, detest) was a river which formed the boundary between Earth and the Underworld (often called Hades which is also the name of this domain's ruler). It circles the Underworld nine times. The rivers Styx, Phlegethon, Acheron and Cocytus all converge at the center of the underworld on a great marsh. The...