Styx

Styx (from the Greek verb signifying “to abhor”) in Greek mythology was one of the principal rivers of the netherworld, where it floeds sluggishly round seven times; and is properly the river of death, which all must cross to enter the unseen world, and of which, in the Greek mythology, Charon (mythology) was the ferryman. In their solemn engagements it was by this river the gods took oath to signify that they would forego their godhood if they swore falsely. The Styx was a branch of the Great Ocean which girds the universe.