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- ObergomsObergoms is the upper part of the Goms and a municipality in the district of Goms in the c
- October Revolution IslandIsland of the Severnaya Zemlya group in the Russian Arctic
- OderRiver in Central Europe
- Oder–Havel CanalCanal in Germany
- Oeno IslandOeno Island ( oh-EE-noh) or Holiday Island is an uninhabited coral atoll in the South Paci
- Oga PeninsulaPeninsula in Akita Prefecture, Japan
- Ogallala AquiferWater table aquifer beneath the Great Plains in the United States of America
- Ogallala FormationThe Ogallala Formation is a Miocene to early Pliocene geologic formation in the central Hi
- Ogi, NiigataOgi (小木町, Ogi-machi) was a town located in Sado Island, Niigata Prefecture, Japan.
- Ogooué RiverRiver in Gabon, Africa
- OʻahuThird largest island in Hawaii
- Ojos del SaladoEarth's highest volcano
- Oka (river)River in western Russia
- Okapi Wildlife ReserveWorld Heritage Site
- Okavango DeltaRiver delta in Botswana
- Okavango RiverMajor river in southern Africa
- Okinawa IslandLargest of the Okinawa Islands in Japan
- Okinawan languageNorthern Ryukyuan language
- Old FaithfulCone geyser in Yellowstone National Park
- Old Man of HoySea stack in Orkney, Scotland
- Old Salt RouteThe Old Salt Route was a medieval trade route in Northern Germany, one of the ancient netw
- Olympic MountainsMountain range in Washington, United States
- Olympic National ParkNational park in Washington, United States
- Olympic PeninsulaPeninsula in Washington, United States
- OmetepeIsland in Lake Nicaragua
- Omo RiverRiver in southwestern Ethiopia
- Omo River (Quebec)The Omo River is a tributary of the Maicasagi River located at Eeyou Istchee Baie-James (m
- Omsukchan RangeThe Omsukchan Range (Russian: Омсукчанский хребет) is a mountain range in the Magadan Obla
- OngeEthnic group of Andaman Islands
- OnotoaOnotoa is an atoll of Kiribati. It is situated in the Gilbert Islands in the Pacific Ocean
- Ontong Java AtollGroup of islands in Solomon Islands
- Ōnuma Quasi-National ParkŌnuma Quasi-National Park (大沼国定公園, Ōnuma Kokutei Kōen) is a 90.83 km2 (35.07 sq mi) quasi-
- Operation GrappleSeries of British nuclear weapons tests
- Operation Grapple (Yugoslavia)Operation Grapple was the codeword used to cover UK defence operations in support of the U
- Optymistychna CaveGypsum cave system in Korolivka, Ukraine
- Orderville, UtahOrderville is a town in western Kane County, Utah, United States. The population was 577 a
- Ordesa ValleyValley in Sobrarbe, Spain
- Ordesa y Monte Perdido National ParkOrdesa y Monte Perdido National Park (Parque nacional de Ordesa y Monte Perdido) is an IUC
- Ordnance Survey National GridSystem of geographic grid references used in Great Britain
- Orinoco wetlandsThe Orinoco wetlands (NT0906) is an ecoregion of northeast Venezuela within the northern O
- OrkneyArchipelago, county and council area in northern Scotland
- Oro ProvinceOro Province, formerly (and officially still) Northern Province, is a coastal province in
- Orontes RiverRiver in West Asia
- OrsangThe Orsang River flows through the Chhota Udaipur district and Vadodara district in Gujara
- OrzinuoviOrzinuovi (Italian pronunciation: ; Brescian: I Urs Nöf) is a town and comune in the provi
- Oshima PeninsulaSouthernmost part of Hokkaidō
- Oswego CanalThe Oswego Canal is a canal in the New York State Canal System located in New York, United
- Ottawa RiverRiver in Canada
- Otter Lake (Saskatchewan)Otter Lake is a lake in the province of Saskatchewan, Canada. It is located 80 kilometres
- OukaïmedenOukaïmeden (Berber language: Ukayemdan) is a ski resort in the Atlas Mountains near the To
- Oum Er-Rbia RiverRiver in Morocco
- OurceThe Ource (French: ) is a 100 km (62 mi) long river in northeastern France, a right tribut
- OuseburnThe Ouseburn is a small river in Newcastle upon Tyne, England that flows through the city
- Outer BanksBarrier islands in North Carolina and Virginia, United States
- Outer HebridesArchipelago and council area off the west coast of mainland Scotland
- Overseas collectivityType of French territorial collectivity
- Owlshead MountainsThe Owlshead Mountains are at the southern end of Death Valley National Park near the bord
- Oxford Ring RoadThe Oxford Ring Road circles the city of Oxford, England. It is a dual carriageway ring ro
- Oxley, New South WalesOxley is a community on the lower Lachlan River in the Riverina district of New South Wale
- OzarksHighland region in central-southern United States
