Cirith Iaur (S."Old Pass") was a mountain pass in the Ered Nimrais west of the Lefnui and opposite the wild region known to the Dúnedain as Druwaith Iaur. Following the course of the Rámanen stream, Cirith Iaur crossed over a low-lying ridge into the fens and woodlands of the Iaurló west of the White Mountains. It is possible that the element "Iaur" referred not to the land beyond the pass, but rather to the fact that this may have been the first pass into the Nan Lefnui which the early Númenórean explorers discovered as they forged eastwards from the coasts of Enedhwaith.