INFERNO: Canto 14 - The Burning Blasphemers
THE BURNING BLASPHEMERS In this canto, Dante and Virgil continue across the middle ring of the 7th Circle of hell, where they encounter a giant warrior with a chip on his shoulder. Then Virgil teaches the pilgrim about the tragic source of all the rivers of the inferno.
Further Reading:
Virgil's Use of Image and Allegory Moral Hydrography of Hell (free account req)