From Tolkien Gateway

Beeches (S. neldor[1]) were broad and tall trees that grew throughout Middle-earth, and especially in its northern regions. The most famous beech-forest of all was Neldoreth in Doriath.[2] Hírilorn, the three-trunked tree in which Lúthien was imprisoned, was perhaps the greatest beech that had ever grown.[3] In the attack on Isengard by the Ents, the Ent which caught fire and burned to death was called Beechbone.[4]

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