A misty region near Helcaraxë (S/80). Its initial element seems to be oi(o) “ever”, but the meaning of the second element is unclear. Helge Fauskanger suggested the second element might mean “*mist” (QQ/Oiomúrë), and Robert Ireland suggested that it might be connected to the roots √MOR “black” and/or ᴹ√MUY “hidden, secret”, so that the name means “*Everlasting Veil” (ATD/Oiomúrë).