§ Of Túrin Turambar The Silmarillion

Now Turambar came to Nen Girith at sundown, and there he learned that Glaurung lay on the brink of the high shores of Teiglin, and was like to move when night fell. Then he called those tidings good; for the dragon lay at Cabed-en-Aras, where the river ran in a deep and narrow gorge that a hunted deer might overleap, and Turambar thought that he would seek no further, but would attempt to pass over the gorge. Therefore he purposed to creep down at dusk, and descend into the ravine under night, and cross over the wild water; and then to climb up the further cliff, and so come to the dragon beneath his guard.