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|Location||Between Teiglin and Sirion|
|Description||Forest of silver birches, with Amon Obel amidmost|
|Etymology||S. brethil, "silver birch"|
Brethil was a cluster of woods between the Teiglin and the Sirion, originally part of Doriath. It was to Brethil that the House of Haleth removed after dwelling east of the river Gelion. Some Drúedain also dwelt there. The main feature of the forest was the hill of Amon Obel, upon which stood Ephel Brandir, the main settlement of the Haladin.
King Thingol granted Brethil to the Men of the House if Haleth, on the condition that they guard the Crossings of Teiglin. This condition they readily accepted. The men of Brethil also took part in the Nirnaeth Arnoediad, were they were all slain.
Túrin came here after the destruction of Nargothrond and the journey to Dor-Lómin, and rested here for a while, until rumours came again about Glaurung, the father of all dragons. At the borders of this forest Glaurung was slain by Túrin.