The area serves as a multiplayer map in StarCraft: Brood War. It supports up to four players.
The name of the River Lethe probably refers to the River Lethe of Greek mythology. It is one of the five rivers of the underworld, and its name means "forgetfulness."
StarCraft: Brood War. Vivendi Games. Brood War Maps, River Lethe. (in English). 1998