R
- Rathlóriel
- See Ascar.
- Redwater
- See Carnen
- Ringwil
- A tributary of Narog. It began in the hills about Nargothrond, and flowed north of the hidden city.
- Where it met the Narog a secret door was built, which was used by Lúthien to escape from Nargothrond when Celegorm and Curufin held her prisoner.
- Rivil
- A tributary of Sirion. It began in Dorthonion, and then flowed north-west until it met with Sirion in the Fens of Serech.
- The river is mentioned twice in The Silmarillion. The first mention is in the chapter concerning Beren and Lúthien. Rivil's Well was where a camp was made by the Orcs that had killed Barahir, father of Beren. Beren attacked them there, taking back the Ring of Barahir before escaping again.
- The second mention is in the chapter concerning the Nírnaeth Arnoediad, where the valiant retreat of Húrin and Huor is described thus: "...foot by foot they withdrew, until they came behind the Fen of Serech, and had the stream of Rivil before them. There they stood and gave way no more."
- Rushdown
- An early tributary to the Anduin river flowing from the Misty Mountains. Early writings of Tolkien also gave its Sindarin name Rhimdath.
- Ringló
- A river of Gondor arising as two smaller unnamed rivers in the White Mountains, on the southern arm that bent towards Belfalas. Flowing through the city Ethring, it passed north of Tarnost, where it was met by Ciril, and poured into the sea together with Morthond at Edhellond.
- Running
- See Celduin
Read more about this topic: List Of Middle-earth Rivers