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An island of the Stanton Group off Mac.Robertson Land. Mapped from air photographs taken by the Lars Christensen Expedition (1936-37) and named Andöya by Norwegian cartographers. (see Hansen chart 6) Renamed after W.H. Oldham, magnetician at Mawson in 1955. First visited by ANARE party led by John Béchervaise in August, 1955.

An island about 0.5 km north-west of Magnetic Island, Vestfold Hills. Mapped by Norwegian cartographers from air photographs taken by the Lars Christensen Expedition (1936-37).

Three, partly snow-covered ridges about 43 km south-east of Mount Bunt in the Aramis Range, Prince Charles Mountains. The ridges have a steep rock face on the south-west side. Plotted from ANARE air photographs taken in 1960. Named after R.A. O''Leary, Officer-in-Charge at Wilkes in 1964.

A nivi feeding the Prince Philip Glacier (Ross Dependency) and the Lucy Glacier to the west of the Cobham Range. Discovered by the N.Z. Geological Expedition (1964-65). Named after Lieut. Olsen, USN, who flew members of the expedition to the nivi and who also supported them on other flying operations.

A peak with local relief of about 200 m between Mason Nunatak and Score Ridge in the Meteorite Hills, Darwin Mountains.

A small cove in the Vestfold Hills, approximately 200 m in diameter which is almost fully enclosed by two moraine ridges on the southern side.

An island, just west of Midgley Island, Windmill Islands. Plotted from air photographs taken by USN Operation Highjump (1946-47). Named after A. Ommundsen, a member of the 1958 Wilkes party.  

A valley in the Miller Range, just south of Argosy Glacier. Plotted by the US Geological Survey from air photographs taken by the US Navy in 1960-62. Named after J.S. Ong, traverse engineer on the South Pole Traverse in 1962-63 and the Byrd Traverse in 1963-64.

A bare rock eminence rising from surrounding high drifts about 2 km south of Mount Henderson, Mac.Robertson Land. Visited by ANARE parties since 1954. Named after L. Onley, weather observer at Mawson in 1959.

A well defined embayment west of Cape Bruce, Mac.Robertson Land. Discovered on 18 February 1931 by BANZARE (1929-31) under Sir Douglas Mawson.

A small island about 0.5 km across lying on the western side of Oom Bay. Mapped by Norwegian cartographers from air photographs taken by the Lars Christensen Expedition (1936-37) and called Uksøy.

A bay just north-west of Molodezhnaya station on the coast of Enderby Land. Photographed by ANARE in 1956 and the Soviet Antarctic Expedition in 1957. Named Bukhta Opasnaya (Dangerous Bay) by the Soviet Expedition.

A peak above the Onnum Valley to the south of Derrick Peak, Britannia Range in the Eastern AAT. The steep lower slopes are of beacon sandstone and the top part of the mountain is made up of a thick dolerite sill.

High rocky palisades of columnar dolerite overlooking the sea to the west of Cape Blake, on the coast of George V Land. Discovered by AAE (1911-14) under Sir Douglas Mawson, who named it because of the similarity of the rock structure to organ pipes.

This hypersaline lake in the Vestfold Hills is richly served by organic inputs from penguins. As a result crusts of dead algae surround the lake and the water has an "earthy smell".

A rocky island about 160 metres in length in Cave Bay on the western side of Heard Island. Named after the American merchant ship Oriental, from which Captain Heard sighted Heard Island on 25 November 1853.

A peak in the Miller Range which falls in vertical cliffs on the eastern side of the Marsh Glacier. Discovered on 26 December 1957, by the Southern Survey Party of the New Zealand component of the TAE (1956-58). Named after H. Orr, IGY scientist at Scott Base in 1957.

A cave in the western wall of Cave Ravine on Ardery Island, Windmill Islands. Discovered in October, 1961, by Dr. M.N. Orton, medical officer at Wilkes after whom it was named.  

A shoal of rock, about 45 m in diameter, with a least depth of 61 cm, 3.7 km from the summit of Shirley Island, Windmill Islands. Charted during a hydrographic survey of Newcomb Bay and Approaches by d' A.T. Gale, hydrographic surveyor with the ANARE Expedition on the MV Thala Dan, 1962, led by Phillip Law. Named after Dr. M.N. Orton, medical officer at Wilkes in 1961, who assisted with the survey.  

A small peak just south of Mount McCarthy in the eastern part of the Porthos Range, Prince Charles Mountains. Plotted from ANARE air photographs taken in 1956 and 1960. An astrofix was obtained by S.L. Kirkby, surveyor at Mawson in 1956. Named after J.H. O'Shea, radio officer at Wilkes in 1962 and 1964 and at Macquarie Island in 1966.