Ginglith
From Tolkien Gateway
The river Ginglith was a river of Beleriand and a tributary to Narog.[1]
The Ginglith had its wells in the woods of Núath, under the near the Ered Wethrin in northern West Beleriand.[2] After passing by the lands of Tumhalad it met the Narog about 50 Númenórean miles north of Nargothrond.