How many rivers are there in the Greek underworld of the afterlife?

Answer:
Five (5) is the number of rivers in the Greek Underworld of the afterlife.

Specifically, Acheron provides entry into the Underworld by way of the ferryboat operator, Charon. It also is called the river of sorrow, at the leaving of the transitory world for the eternal. It is the source of the Underworld rivers of lamentation (Cocytus) and of hate (Styx). The remaining two rivers are the Phlegethon, or the river of fire, and the Lethe, or the river of forgetfulness.
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