War of Wrath
At the end of the First Age of Middle-earth, Beleriand was broken in the War of Wrath by the angelic beings, the Maiar, against the demonic Morgoth (himself a Vala fallen into evil). As the inhabitants of Beleriand, including masterless Orcs, beasts of Angband, Elves, Men and Dwarves, fled, much of Beleriand sank in the sea. Only a small section of East Beleriand remained, and was known thereafter as Lindon, in the Northwest of Middle-earth of the Second and Third Age. Other parts of East Beleriand survived into the Second Age, but were completely destroyed along with the island kingdom of Númenor. Fulfilling a prophecy, the graves of Túrin Turambar and Morwen survived as the island Tol Morwen. Likewise, a part of Dorthonion became Tol Fuin, and Himring became an island.