Region between Doriath and the river Narog appearing on revisions to the Silmarillion map from the 1950s-60s, also labeled “Mid-Beleriand” (WJ/184). According to Christopher Tolkien, this name appears nowhere else (WJ/190 note #60). The meaning of this name does not match its gloss. David Salo suggested it might be a combination of meth “end”, the lenited form of sîr “river” with the dual suffix -ad (GS/384).
place name. ?End of Two Rivers
Word Gloss meth “last, last; [N.] end” sîr “river, stream” -ad “dual”