River Glithui

A small river that rose beneath Amon Darthir in the Mountains of Shadow, beneath a steep and treacherous pass out of Dor-lómin into West Beleriand. It flowed southward away from the mountains for less than fifty miles, after which its waters ran into the Teiglin, and on into the mighty river Sirion.

The Glithui is shown on the map that accompanies The Silmarillion, but is not labelled there. It is the minor tributary that joins the Teiglin a little to the north of the River Malduin.