Originally a large island, which had been in the middle of Belegaer since the destruction of the Lamps of the Valar. It was uprooted by Ulmo and moved like a big ship to the Bay of Balar where the Vanyar and the Noldor embarked upon it and were drawn to Valinor.
Part of the island which broke off remained in the Bay of Balar and formed the Isle of Balar.
After their arrival in the Bay of Eldamar the island was rooted to the foundations of the sea and named Tol EressŽa, the LonelyIsle.
Also called the LonelyIsle, LonelyIsland or the LostIsle. Its Gnomish name was DorFaidwen.