The article is on the pool just below Henneth Annûn. For the chapter in The Two Towers (novel) see: The Forbidden Pool.

The Forbidden Pool in The Two Towers (film).

"Far below them they saw the white waters pour into a foaming bowl, and then swirl darkly about a deep oval basin in the rocks, until they found their way out again through a narrow gate, and flowed away, fuming and chattering, into calmer and more level reaches." --The Two Towers

The Forbidden Pool was a basin of water created by the waterfall that concealed one of the two entrances into the hiding place of the rangers of Ithilien.[1]


The Gondor rangers of Henneth Annûn fiercely protected the secrecy of their refuge. Anyone who came to Henneth Annûn unbidden was to be killed, and this pool was deemed one of the boundaries. Gollum, searching for fish, chanced to find the pool by accident, but was spared death thanks to his master, Frodo Baggins.[2]

Behind the Scenes

It was revealed in the appendices of the film that the water used for the pool had chemicals in it to produce believable foam.

Lakes of Arda

Bywater Pool | Forbidden Pool | Gollum's lake | Great Lake | Kheled-zâram (Mirrormere) | Lake Evendim | Lake Helevorn | Lake Mithrim | Linaewen | Long Lake | Lórellin | Nen Hithoel | Nísinen | Tarn Aeluin


  1. The Atlas of Middle-earth, The Lord of the Rings, "Henneth Annûn"
  2. The Lord of the Rings, The Two Towers, Book Four, Chapter VI: "The Forbidden Pool"
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