§ Of the Coming of Men into the West The Silmarillion

When three hundred years and more were gone since the Noldor came to Beleriand, in the days of the Long Peace, Finrod Felagund lord of Nargothrond journeyed east of Sirion and went hunting with Maglor and Maedhros, sons of Fëanor. But he wearied of the chase and passed on alone towards the mountains of Ered Lindon that he saw shining afar; and taking the Dwarf-road he crossed Gelion at the ford of Sarn Athrad, and taming south over the upper streams of Ascar, he came into the north of Ossiriand.