Sindarin 

eryd-wethion

place name. Mountains of the Region of Shadows

A reappearance of the name N. Eredwethion from the 1930s, appearing in notes from the 1950s as both Eryd-wethion and Erydweithian(d) (PE17/42-3, WJ/113). At this stage, it appears the final element is no longer the genitive plural, but is one of the suffixes -ion or -ian(d) used in regional names. This name was replaced by Ered Wethrin; see that entry for further discussion.

Sindarin [PE17/042; PE17/043; WJ/113] Group: Eldamo. Published by