Comb Ridge, or Tséyíkʼáán in Navajo, is a long monocline in southeastern Utah and northeastern Arizona and one of the region’s most striking structural landforms. Nearly eighty miles long, it marks a deep fault on the east margin of the Monument Uplift and exposes a sequence of formations from Navajo Sandstone to the Permian Organ Rock Formation. Its significance also lies in natural history and archaeology: it was designated a National Natural Landmark in 1976 as the only North American site with tritylodont fossils, and its southern reaches preserve traces of Ancestral Puebloan culture, including many cliff dwellings. Parts of it in Utah are now protected within Bears Ears National Monument.