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The river Styx. This was very dangerous, and you had to pay drachma to the ferryman to get across.
The Nile River is longer than the Styx River.
Yes, there is the River Styx in the state of Georgia.
The River Styx is normally thought to be a lime green
It is called Stix and Heraculs used it to get Cerberus out of the UnderWorld