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- OblastFirst-level administrative division in several countries
- Observation Hill (McMurdo Station)Landform in Antarctica
- OccidentalismImitation or depiction of Western culture
- Occitania (administrative region)Administrative region of France
- Oceanian realmTerrestrial biogeographic realm
- Old North (Britain)Term for medieval Brittonic-speaking northern Britain
- OlderdalenOlderdalen (Norwegian), Dálusvággi or Dálvvesvággi (Northern Sami), or Talosvankka (Kven)
- OllagüeStratovolcano in Bolivia and Chile
- Olonetsky DistrictDistrict in Republic of Karelia, Russia
- Omineca MountainsGroup of mountain ranges in British Columbia, Canada
- One Tree Hill, South AustraliaOne Tree Hill is a town on the outskirts of Adelaide, South Australia. It is located in th
- Onega BayThe Onega Bay (Russian: Онежская губа, Онежский залив) is located in the Republic of Karel
- Onkaparinga RiverThe Onkaparinga River, known as Ngangkiparri or Ngangkiparingga ("place of the women’s riv
- OotyHill station in Tamil Nadu, India
- Ooty LakeOoty lake is an artificial lake near Ooty in the Nilgiris district of Tamil Nadu, India. I
- Op de VrouweheideOp de Vrouweheide (English: On the Vrouweheide) is a windmill located on the Vrouwenheide
- OphirBiblical port famous for its wealth
- Ordnance Survey InternationalOS collection for former British colonies
- Oregon Coast RangeMountain range in Oregon, United States
- Orinoco BasinSouth American drainage basin
- OrléanaisFormer province of France
- Orthographic map projectionAzimuthal perspective map projection
- Ortler AlpsMountain range in Italy and Switzerland
- OssetiaEthnolinguistic region in the Caucasus
- Ostrog (fortress)Ostrog (Russian: острог, IPA: ) is a Russian term for a small fort, typically wooden and o
- Otay Mesa Port of EntryThe Otay Mesa Port of Entry (Spanish: Puerto de Entrada Mesa de Otay) is one of three port
- Otoskwin–Attawapiskat River Provincial ParkOtoskwin–Attawapiskat River Provincial Park is a provincial park in northern Ontario, Cana
- Ouaddaï (region)Region of Chad
- Owltan Rural DistrictRural district in Ardabil province, Iran
- Oyster River, British ColumbiaOyster River is a small community on Vancouver Island, British Columbia, located between C
