N. Dunruin loc. “Red Valley”
Earlier name for Nanduhirion in Lord of the Rings drafts from the 1940s that matched the river name Ruinnel “Red Way” (RS/464). It seems to be a combination of a variant form of tum “valley” and a variant or lenited form of gruin “ruddy”, as suggested by Roman Rausch (EE/1.13).
References ✧ RS/464; RSI