Rivil
From Tolkien Gateway
The Rivil was a lesser tributary of the River Sirion, that rose in the heights of Dorthonion at Rivil's Well and flowed westward to meet the Sirion at the Fen of Serech.
The Rivil was a lesser tributary of the River Sirion, that rose in the heights of Dorthonion at Rivil's Well and flowed westward to meet the Sirion at the Fen of Serech.