Knifelike ridges

Usage examples of aretes.

And after that, they went through winding tunnels, along the bottoms of crevices, over sharp rock ridges like aretes within the mountain, around pits with the moan of water and the reek of decay in their depths, under arches like entryways to grotesque festal halls-turned and climbed and navigated in the darkness as if it were a perilous limbo, trackless and fatal, varying only in the kind and extremity of its dangers.