The term 'River of Hell' is a reference to the mythological river Styx, which was believed to be a boundary between the world of the living and the underworld. In Greek mythology, Styx was a river that the dead had to cross in order to enter the underworld. It was also said to be the river that the gods swore their most binding oaths upon. The word 'Styx' is derived from the Greek word for 'HATEFUL' or 'DETESTED'.