Oona Cliff
Oona Cliff (72°27′S 160°9′E) is a north-facing rock and ice cliff, about 4 nautical miles (7 km) long, situated just northwest of Mount Walton in the Outback Nunataks. Mapped by United States Geological Survey (USGS) from surveys and U.S. Navy air photos, 1959–64. Named by Advisory Committee on Antarctic Names (US-ACAN) for Hain Oona, Estonian ionospheric physicist at South Pole Station, 1968.
This article incorporates public domain material from the United States Geological Survey document: "Oona Cliff". (content from the Geographic Names Information System) 
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