Sind. ?'lake blue'
Tarn in Eastern Dorthonion, hallowed by Melian. In her waters, Aegnor saw the reflection of Andreth and fell in love with her. Years later, the land around the lake was the headquarters of Barahir's outlaws.
|Now the forest of Dorthonion rose southward into mountainous moors; and in the east of those highlands there lay a lake, TarnAeluin, with wild heaths about it, and all that land was pathless and untamed, for even in the days of the LongPeace? none had dwelt there. But the waters of TarnAeluin were held in reverence, for they were clear and blue by day and by night were a mirror for the stars; and it was said that Melian herself had hallowed that water in days of old.|
|Of Beren and Luthien, the Silmarillion|