Aglon

Aglon (Sindarin: 'high walls') is the narrow mountain pass located between high walls, between Dorthonion to the west and Himring to the east. It was of strategic importance since it joined Himlad and Lothlann, being an eastern passage from Angband to the main Beleriand. It was guarded by Celegorm and Curufin but during the Dagor Bragollach the Pass of Aglon was breached and the brothers fled to Nargothrond. Sometime later (around 469 of FA) Maedhros recovered it, but it was again left unguarded when he fled after the Nírnaeth Arnoediad.

As all of Beleriand, it was destroyed in the War of Wrath at the end of the First Age.