Board Thread:General Mod Discussion/@comment-26888709-20170421085717/@comment-26149161-20170421113625

Rohan doesn't have red rock in the book, and the Glittering Caves doesn't have Mithril. They were once the same range, though--the Gap of Rohan is an eroded part of the mountains, as shown by the fault tangle west of Helm's Deep.

Ithilion, Discussions Moderator (Auta i lómë) 11:36, April 21, 2017 (UTC)