Pass into Beleriand from Lothlann between the hills of Dorthonion and Himling. The Pass of Aglon was fortified by Celegorm and Curufin, but the pass was taken by Morgoth's armies during the Dagor Bragollach.

Maedhros soon retook the Pass, but when he fled from the north after the Nirnaeth Arnoediad the pass was left undefended.
Encyclopedia entry originally written by Buckland_Lass