|Location||Dorthonion to the Fen of Serech|
|Description||Lesser tributary of Sirion|
|Events||Death of Huor and capture of Húrin|
During the Nirnaeth Arnoediad King Turgon retreated down the Pass of Sirion. His escape was successful because Húrin and Huor formed a rearguard that used the Rivil as a defense. The host of Angband bridged the stream with the corpses of their dead. Huor was slain beside the Rivil and Húrin was captured.