Nanil Ruin
Marshes lay by the eastern passes into Angmar in a
valley of the Hithaeglir.The Nanil Ruin was the site of volcanic activity and contained many geysers, hot springs, and small volcanoes. Were it not so near the center of the Witch-King' s realm, it would have been a place of great natural beauty and geological interest.
References
- MERP:Angmar (2nd Edition)