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. Beyond this flood a frozen continent Lies dark and wild, beat with perpetual storms Of whirlwind and dire hail, which on firm land Thaws not, but gathers heap, and ruin seems Of ancient pile; all else deep snow and ice, A gulf profound as that Serbonian bog Betwixt Damiata and Mount Casius old, Where armies whole have sunk: the parching air Burns frore, and cold performs the effect of fire. Thither, by harpy-footed Furies haled, At certain revolutions all the damned Are brought; and feel by turns the bitter change Of fierce extremes, extremes by change more fierce, From beds of raging fire to starve in ice Their soft ethereal warmth, and there to pine