Belknap Nunatak (Coordinates: ) is a nunatak about 6 nautical miles (11 km) west-northwest of Shelton Head, surmounting an ice-covered spur on the south coast of Thurston Island. It was mapped by the United States Geological Survey from surveys and from U.S. Navy air photos, 1960–66, and named by the Advisory Committee on Antarctic Names for William Belknap, a field assistant at Byrd Station, 1964–65.
- Thurston Island – Jones Mountains. 1:500000 Antarctica Sketch Map. US Geological Survey, 1967.
- Antarctic Digital Database (ADD). Scale 1:250000 topographic map of Antarctica. Scientific Committee on Antarctic Research (SCAR). Since 1993, regularly upgraded and updated.
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