Places in Middle-earth
Type: Roads, Lanes, Ways
Region: Beleriand & North
Meaning: The Gate of the Noldor
[Tuor] went westwards across Dor-lómin, and found Annon-in-Gelydh, the Gate of the Noldor, which the people of Turgon built when they dwelt in Nevrast long years before. Thence a dark tunnel led beneath the mountains, and issued into Cirith Ninniach, the Rainbow Cleft, through which a turbulent water ran towards the western sea. Thus it was that Tuor's flight from Hithlum was marked by neither Man nor Orc, and no knowledge of it came to the ears of Morgoth.
The Silmarillion, Quenta Silmarillion, Ch 23, Of Tuor and the Fall of Gondolin
Elena Tiriel 7Mar10