Sentinel Buttress (64°4′S 58°8′W) is a prominent crag containing a volcanic breccia sequence, rising to 535 m east of Palisade Nunatak at the head of Rohss Bay, James Ross Island. So named by the United Kingdom Antarctic Place-Names Committee (UK-APC) in 1987 from its commanding position in the area.
This article incorporates public domain material from the United States Geological Survey document "Sentinel Buttress" (content from the Geographic Names Information System).
References
Sentinel Buttress Wikipedia(Text) CC BY-SA