Brithon

From Tolkien Gateway

Brithon was a river of Beleriand that had its wells in the hills lying north-west in West Beleriand south of the Ered Wethrin. It ran south through the Falas to the bay of Brithombar where it met the sea Belegaer.

Etymology

Brithon is Ilkorin for "pebbly".[1]

References