Wikia

The Pass of Sirion was a pass between Ered Wethrin and the Echoriath in the northern Beleriand through which the River Sirion flowed.

The pass served as a main entrance to West Beleriand from Ard-galen.

It was a narrow-like valley whose sheer walls were covered with pine trees. The ground floor was very fertile.

History Edit

When the Ñoldor returned to Middle-earth, they built the tower/fortress of Minas Tirith to keep the enemy out of the West Beleriand. The pass was guarded by Orodreth of the House of Finarfin for his uncle Finrod who guarded it until FA 457, when it was conquered by Sauron. It remained in Sauron's hands until he was driven out by Lúthien and Huan in the mid-460s. Afterwards its defense was neglected.

Elven Realms of Middle-earth throughout the Ages
Years of the Trees:	Cuiviénen \| Eglador \| Havens of the Falas
First Age:	Doriath \| Dorthonion \| Gondolin \| Havens of Sirion \| Havens of the Falas \| Himlad & Pass of Aglon \| Hithlum \| Maglor's Gap \| March of Maedhros \| Nargothrond \| Nevrast \| Ossiriand \| Pass of Sirion \| Thargelion
Second Age:	Eregion \| Greenwood the Great \| Lindon \| Rivendell
Third Age:	Lindon \| Lothlórien \| Northern Mirkwood \| Rivendell
Fourth Age:	Lindon \| Lothlórien & East Lórien \| Rivendell \| Wood of Greenleaves