A river flowing from the Iron Hills, translated “Redwater” (LotR/1072), a combination of caran “red” and nen “water”.
Sindarin
Carnen
noun. red water
carnen
place name. Redwater
Elements
Word Gloss caran “red” nen “water; lake, pool; (lesser) river, water; lake, pool; (lesser) river, [ᴱN.] stream”
carnen
adjective. done, finished
Elements
Word Gloss car- “to do, make”
car (from caran “red”) + nen (“water”)