§ Of the Coming of the Elves and the Captivity of Melkor The Silmarillion

Then one arose in the host of Olwë, which was ever the hindmost on the road; Lenwë he was called. He forsook the westward march, and led away a numerous people, southwards down the great river, and they passed out of the knowledge of their kin until long years were past. Those were the Nandor; and they became a people apart, unlike their kin, save that they loved water, and dwelt most beside falls and running streams. Greater knowledge they had of living things, tree and herb, bird and beast, than all other Elves. In after years Denethor, son of Lenwë, turned again west at last, and led a part of that people over the mountains into Beleriand ere the rising of the Moon.