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Eregion (Ost-in-Edhil) in The Rings of Power

Where Eregion (Ost-in-Edhil) is on the map of Middle-earth in The Rings of Power
appears in 10 episodes · Middle-earth map

Celebrimbor's city of Elven-smiths. The Three Rings are forged here, then the Seven and the Nine under Annatar, and the city is destroyed in Season 2.

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About Eregion (Ost-in-Edhil)

Who lives here: Celebrimbor's Elven-smiths
Landscape: Forge-city · holly trees
Story: Close ally of Khazad-dûm. Its forges make every Ring of Power except the One, and its fall is one of the great disasters of the age.

In Tolkien’s books

Founded by Noldor Elves early in the Second Age; Celebrimbor and his smiths were deceived by Sauron as Annatar. The Three were made by Celebrimbor alone after Annatar left, and Sauron sacked the city about a century later.

The show compresses the timeline: Annatar is present while the Seven and Nine are made, and Eregion falls in the same season.

Episodes set in Eregion (Ost-in-Edhil)

Season 1, Episode 2: Adrift
Elrond · Celebrimbor
Season 1, Episode 5: Partings
Elrond · Durin IV & Disa
Season 1, Episode 8: Alloyed
Galadriel · Sauron (Halbrand / Annatar) · Celebrimbor · Elrond · Gil-galad & Círdan
Season 2, Episode 1: Elven Kings Under the Sky
Elrond · Galadriel · Celebrimbor
Season 2, Episode 2: Where the Stars Are Strange
Sauron (Halbrand / Annatar) · Celebrimbor
Season 2, Episode 3: The Eagle and the Sceptre
Sauron (Halbrand / Annatar) · Durin IV & Disa
Season 2, Episode 5: Halls of Stone
Celebrimbor · Sauron (Halbrand / Annatar)
Season 2, Episode 6: Where Is He?
Celebrimbor · Sauron (Halbrand / Annatar) · Adar · Galadriel
Season 2, Episode 7: Doomed to Die
Elrond · Arondir · Gil-galad & Círdan · Galadriel · Celebrimbor · Adar · Damrod the hill-troll
Season 2, Episode 8: Shadow and Flame
Celebrimbor · Sauron (Halbrand / Annatar) · Adar · Galadriel · Elrond · Gil-galad & Círdan · Arondir · Durin IV & Disa
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What happens here

The Three are forged S1E8
With mithril and Galadriel's dagger, Celebrimbor forges three Elven rings: Nenya, Vilya and Narya.
Halbrand unmasked S1E8
Galadriel realises Halbrand is Sauron. He offers her a throne at his side; she refuses, and he leaves for Mordor.
Annatar S2E2
Turned away as Halbrand, Sauron returns to Celebrimbor in a new, radiant form: Annatar, the Lord of Gifts.
The Nine S2E7
Celebrimbor forges nine rings for Men, then finally sees through Annatar's deception.
Celebrimbor's end S2E8
The Elven-smith warns Sauron that the Rings will be his downfall, and is killed.

Characters who go to Eregion (Ost-in-Edhil)

Elrond · Celebrimbor · Durin IV & Disa · Galadriel · Sauron (Halbrand / Annatar) · Gil-galad & Círdan · Adar · Arondir · Damrod the hill-troll