Encircling Mountains
From Tolkien Gateway
Also called the Echoriad and (in the south) the Crissaegrim; the circular mountain range that surrounded and concealed the valley of Tumladen and the city of Gondolin.
Also called the Echoriad and (in the south) the Crissaegrim; the circular mountain range that surrounded and concealed the valley of Tumladen and the city of Gondolin.