Sea of Helcar
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In the beginning of Arda, the Valar created the Two Lamps and two great towers on which to place them. Due to Melkor's deceit these were destroyed, and where Illuin, the northern tower, had stood a great inland sea was formed. This became the Sea of Helcar, connected to the Great Gulf to the west by the Straits of the World. Cuiviénen, where the Elves first awoke, was a gulf in the Sea of Helcar. Later, during the Great Journey, the Elves travelled to the north of the Sea through Wilderland on their way to Beleriand.
Christopher Tolkien and others have speculated whether or not the Sea of Rhûn can "...be identified with the Sea of Helkar, vastly shrunken" . In The Atlas of Middle-earth, Karen Wynn Fonstad assumed that the lands of Mordor, Khand, and Rhûn lay where the Sea of Helcar had been, and that the Sea of Rhûn and Sea of Núrnen were its remnants.. However, in The Peoples of Middle-earth, there are references to the Sea of Rhûn and its surrounding geographical landmarks existing as far back as the Years of the Trees at the time of the Great Journey, with no indication as to whether it should be equated with the Sea of Helcar or not. Additionally, it is told in Unfinished Tales that the migration of the Drúedain from Hildórien brought them westward through lands south of Mordor.