The Silmarillion

But Manwë put forth Morgoth and shut him beyond the World in the Void that is without; and he cannot himself return again into the World, present and visible, while the Lords of the West are still enthroned. Yet the seeds that he had planted still grew and sprouted, bearing evil fruit, if any would tend them. For his will remained and guided his servants, moving them ever to thwart the will of the Valar and to destroy those that obeyed them. This the Lords of the West knew full well. When therefore Morgoth had been thrust forth, they held council concerning the ages that should come after. The Eldar they summoned to return into the West, and those that hearkened to the summons dwelt in the Isle of Eressëa; and there is in that land a haven that is named Avallónë, for it is of all cities the nearest to Valinor, and the tower of Avallónë is the first sight that the mariner beholds when at last he draws nigh to the Undying Lands over the leagues of the Sea. To the Fathers of Men of the three faithful houses rich reward also was given. Eönwë came among them and taught them; and they were given wisdom and power and life more enduring than any others of mortal race have possessed. A land was made for the Edain to dwell in, neither part of Middle-earth nor of Valinor, for it was sundered from either by a wide sea; yet it was nearer to Valinor. It was raised by Ossë out of the depths of the Great Water, and it was established by Aulë and enriched by Yavanna; and the Eldar brought thither flowers and fountains out of Tol Eressëa. That land the Valar called Andor, the Land of Gift; and the Star of Eärendil shone bright in the West as a token that all was made ready, and as a guide over the sea; and Men marvelled to see that silver flame in the paths of the Sun.

Then the Edain set sail upon the deep waters, following the Star; and the Valar laid a peace upon the sea for many days, and sent sunlight and a sailing wind, so that the waters glittered before the eyes of the Edain like rippling glass, and the foam flew like snow before the stems of their ships. But so bright was Rothinzil that even at morning Men could see it glimmering in the West, and in the cloudless night it shone alone, for no other star could stand beside it. And setting their course towards it the Edain came at last over leagues of sea and saw afar the land that was prepared for them, Andor, the Land of Gift, shimmering in a golden haze. Then they went up out of the sea and found a country fair and fruitful, and they were glad. And they called that land Elenna, which is Starwards; but also Anadûnë, which is Westernesse, Númenórë in the High Eldarin tongue.

This was the beginning of that people that in the Grey-elven speech are called the Dúnedain: the Númenóreans, Kings among Men. But they did not thus escape from the doom of death that Ilúvatar had set upon all Mankind, and they were mortal still, though their years were long, and they knew no sickness, ere the shadow fell upon them. Therefore they grew wise and glorious, and in all things more like to the Firstborn than any other of the kindreds of Men; and they were tall, taller than the tallest of the sons of Middle-earth; and the light of their eyes was like the bright stars. But their numbers increased only slowly in the land, for though daughters and sons were born to them, fairer than their fathers, yet their children were few.

Of old the chief city and haven of Númenor was in the midst of its western coasts, and it was called Andúnië because it faced the sunset. But in the midst of the land was a mountain tall and steep, and it was named the Meneltarma, the Pillar of Heaven, and upon it was a high place that was hallowed to Eru Ilúvatar, and it was open and unroofed, and no other temple or fane was there in the land of the Númenóreans. At the feet of the mountain were built the tombs of the Kings, and hard by upon a hill was Armenelos, fairest of cities, and there stood the tower and the citadel that was raised by Elros son of Eärendil, whom the Valar appointed to be the first King of the Dúnedain.

Now Elros and Elrond his brother were descended from the Three Houses of the Edain, but in part also both from the Eldar and the Maiar; for Idril of Gondolin and Lúthien daughter of Melian were their fore-mothers. The Valar indeed may not withdraw the gift of death, which comes to Men from Ilúvatar, but in the matter of the Half-elven Ilúvatar gave to them the judgement; and they judged that to the sons of Eärendil should be given choice of their own destiny. And Elrond chose to remain with the Firstborn, and to him the life of the Firstborn was granted. But to Elros, who chose to be a king of Men, still a great span of years was allotted, many times that of the Men of Middle-earth; and all his line, the kings and lords of the royal house, had long life even according to the measure of the Númenóreans. But Elros lived five hundred years, and ruled the Númenóreans four hundred years and ten.