Milton, Rivers of Darkness

From Paradise Lost 

ABHORRED Styx, the flood of deadly hate,
Sad Acheron of sorrow black and deep;
Cocytus named of lamentation loud
Heard on the rueful stream; fierce Phlegethon
Whose waves of torrent fire inflame with rage.
Far off from these a slow and silent stream,
Lethe, the river of oblivion, rolls
Her watery labyrinth, whereof who drinks
Forthwith his former state and being forgets,
Forgets both joy and grief, pleasure and pain.

Cf. Hesiod : Genesis & Plato : The real world

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