Oldest Road

The Oldest Road is an ancient system of cavernways below the Hithaeglir that was enlarged to a vast subterranean road by the Orcs and connects Gundabad and Carn Dûm with the Under-Grottos, the Deep-Mines, the Under-Gates, Misty Mountain-Deeps the Riddle Caves and Ghost-Caves and finally the Gem-Deeps.