Black Thumb (Coordinates: ) is a mountain, 1,190 metres (3,900 ft) high, with notched and precipitous sides, standing between Romulus Glacier and Bertrand Ice Piedmont on the west coast of Graham Land. It was charted and named by the British Graham Land Expedition under John Rymill, 1934–37.
- This article incorporates public domain material from the United States Geological Survey document "Black Thumb" (content from the Geographic Names Information System).
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