The shining lake that formed at the source of the river Narog on the southern slopes of the Mountains of Shadow. For most of the history of the First Age, the Beautiful Mere remained under the power and protection of Ulmo, and was a place of joy and healing. The Mereth Aderthad or Feast of Reuniting was held on the shores of the mere, and long afterwards Túrin was brought here to be cured of his madness. The Beautiful Mere did not survive to the end of the First Age; the Dragon Glaurung passed this way on his journey to the Sack of Nargothrond and defiled the springs that fed the crystal lake.