Sind. 'Meres of Twilight'
Where Sirion met Aros, right before falling beneath the Andram, the water was branched into a maze of lakes and fens. The place was enchanted by Melian and Ulmo, and under the control of Thingol, whose border guards ran secret ferries. The waters collected at the south and fell from Andram forming the Falls of Sirion.
Near here, Ulmo sent to Turgon and Finrod each a vision, leading them each to search for a place where a hidden stronghold could be established, resulting in the establishment of Nargothrond and Gondolin. Later, after his release from Angband, Húrin was here found by the Elves of Doriath and brought before King Thingol bearing the Nauglamír.
They were also called Meres of Twilight or TwilightMeres.
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