Firienholt

"Yonder is the Firienholt. But what lies beyond no man knows."

― The War of the Ring, Part Three, Many Roads Lead Eastward, pg. 318

Firienholt was a wood that stood on the borders of Rohan and Gondor, about and on the slopes of the Halifirien.

From beneath its trees flowed the Mering Stream, which marked the precise border between the Eastfold, and the Gondorian land of Anórien. To the south of the wood, the White Mountains rose up, and in particular a prominent peak stood above the forest: the Halifirien, which for many years was the site of the Tomb of Elendil.

Etymology

firien holt means 'mountain wood', though it is rather more commonly referred to simply as the 'Firien Wood', taking its name from Halifirien.