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Olduvai Gorge (geographical area, Tanzania)
Olekma (river, Russia)
Olenek (river, Russia)
Olinda (city, Brazil)
Olives, Mount of (mountains, Jerusalem)
Olomouc (city, Czech Republic)
Olsztyn (city, Poland)
Olympia (city, Washington)
Olympia (city, ancient Greece)
Olympic Mountains (mountains, Washington)
Olympus (mountains, Greece)
Olynthus (ancient city, ancient Greece)
Om (river)
Omaha (city, Nebraska)
Oman (country)
Omdurman (city, Sudan)
Omiya (city of east-central Honshu)
Omolon (river)
Omsk (city, Russia)
Onega Bay (arm of the White Sea in northwest Russia)
Onega, Lake (lake, Russia)
Oneida (city, New York)
Oneida Lake (lake, New York)
Onitsha (city, Nigeria)
Ontario (province, Canada)
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Ontario (city, California)
Ontario, Lake (lake, Canada/New York)
Opole (city, Poland)
Oporto (city, Portugal)
Oradea (city, Romania)
Oral (city, Kazakhstan)
Oran (city, Algeria)
Orange (city, California)
Orange Free State (province, South Africa)
Orange River (river, Africa)
Ordos (region, China)
Örebro (city, Sweden)
Oregon (state, United States)
Oregon Trail (road, United States)
Orekhovo-Zuyevo (city, Russia)
Orel (city, Russia)
Orem (city, Utah)
Orenburg (city, Russia)
Orense (city, Spain)
Oresund (body of water, Sweden/Denmark)
Orinoco (river, Venezuela)
Orizaba (city, Mexico)
Orkney Islands (former region, island group, Scotland)
Orlando (city, Florida)
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