§ Of the Flight of the Noldor The Silmarillion

Now Fëanor led the Noldor northward, because his first purpose was to follow Morgoth. Moreover Túna beneath Taniquetil was set nigh to the girdle of Arda, and there the Great Sea was immeasurably wide, whereas ever northward the sundering seas grew narrower, as the wasteland of Araman and the coasts of Middle-earth drew together. But as the mind of Fëanor cooled and took counsel he perceived overlate that all these great companies would never overcome the long leagues to the north, nor cross the seas at the last, save with the aid of ships; yet it would need long time and toil to build so great a fleet, even were there any among the Noldor skilled in that craft. He resolved now therefore to persuade the Teleri, ever friends to the Noldor, to join with them; and in his rebellion he thought that thus the bliss of Valinor might be further diminished and his power for war upon Morgoth be increased. He hastened then to Alqualondë, and spoke to the Teleri as he had spoken before in Tirion.