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General Information
Other namesGate Stream
LocationEriador west of Moria
DescriptionLesser tributary of Glanduin
EventsJourney of the Fellowship of the Ring to the South

The Sirannon, or Gate Stream, was a stream in Eriador.

Beginning at the Silvertine, it flowed past the gates of Moria (hence its name) to Ost-in-Edhil, the old capital city of the Noldor of Eregion, where it joined the river Glanduin. The Sirannon dropped over the Stair Falls beyond the gates of Moria, and its sound was heard from miles around.[1]

On 13 January T.A. 3019[2] (by which point both Moria and Eregion had long been abandoned), the Fellowship of the Ring found that the Sirannon had been dammed by someone or something, and before the gates of Moria there was now a foul lake. In this lake dwelt the Watcher in the Water, who nearly caught the Ringbearer Frodo Baggins.[1]

Some time during the Fourth Age, the Sirannon was probably cleansed, as Moria was eventually resettled by Dwarves.


  1. 1.0 1.1 J.R.R. Tolkien, The Lord of the Rings, The Fellowship of the Ring, "A Journey in the Dark"
  2. J.R.R. Tolkien, The Lord of the Rings, Appendix B, "The Third Age"