Upper Jaw Glacier (78°21′S 162°57′E) is an on a map, the combined shapes of the Upper and Lower Jaw Glaciers resemble a gaping mouth, an idea strengthened by the proximity of Shark Fin.
Map of Upper Jaw Glacier, Antarctica
This article incorporates public domain material from the United States Geological Survey document "Upper Jaw Glacier" (content from the Geographic Names Information System).
References
Upper Jaw Glacier Wikipedia(Text) CC BY-SA