bel is a Pre-Númenórean word or element of unknown meaning. It is seen in the name Belfalas.
The scholars of Gondor could only speculate the original meaning of bel; it's possible that it has the meaning of "shore" as does the second element falas.
Since the great bay between Umbar and Andrast (the Long Cape, beyond Lefnui) was called Côf (gwaeren) Bêl "(windy) Bay of Bêl" scholars also considered possible that Bêl was the name of the region later called Dor-en-Ernil before settled by the Dúnedain.
 See also
J.R.R. Tolkien, The Adventures of Tom Bombadil, "Preface"
- ↑ J.R.R. Tolkien, "The Rivers and Beacon-hills of Gondor" (edited by Carl F. Hostetter), in Vinyar Tengwar, Number 42, July 2001, p. 15