Adorn

The river Adorn (name of pre-Rohirian, possible Dunlendish origin) was one of the rivers which arose in the White Mountains flowing northwest, and together with the river Angren (or Isen) formed the western border of the Kingdom of Rohan. The Adorn joined with the Isen about 150 Númenórean miles west of the Gap of Rohan.

The triangle of land between the Isen, Adorn, and the White Mountains was nominally part of the Kingdom of Rohan, but in the late Third Age it was a contested area between the Rohirrim and the Dunlendings.

References

• The Lord of the Rings, Appendix A, "The House of Eorl" pg. 346, 350
• Unfinished Tales, "Cirion and Eorl" pg. 305-6
• Unfinished Tales, "The Battles of the Fords of Isen" pg. 364-65 note 4