
Hence the name Nardol [was] was on the end of a high ridge, originally part of the Druadan Forest, but long deprived of trees by masons and quarriers who came up the Stonewain Valley. Nardol was manned by a guard, who protected the quarries; it was well-stored with fuel and at need a great blaze could be lit, visible on a clear night even as far as the last beacon some hundred and twenty miles to the westward. The line of beacons from Nardol to Halifirien lay in a shallow curve bending a little southward, so that the three intervening beacons did not cut off the view.
-The Lord of the Rings: A Reader's Companion, p. 510
Nardol is a Beacon-hill that hosts a guard station and a large signal fire. It has a commanding view of the plains of Anórien to the north.