Geography

Oklahoma

Oklahoma: geography, history, economy, and culture

Concise encyclopedia overview of Oklahoma: its geography, history, economy, people, and notable features, with quick facts and further references.

Oklahoma County, Oklahoma

Oklahoma Panhandle

Öland

Öland — Swedish island in the Baltic Sea

Öland County

Öland County (1819–1826) — former Swedish county

Olduvai Gorge

Olduvai Gorge: Key site for early human history in East Africa

Olia chain

Olmsted County, Minnesota

Olmsted County, Minnesota — Overview and History

Olomouc Region

Olomouc Region — geography, history, economy and attractions

Olpe (district)

Olt (river)

Olt River

Olt County

Olt County (Romania)

Olten District

Olten District (Canton of Solothurn, Switzerland)

Oltenia

Oltenia — historical region of southwestern Romania

Oltingue

Oltingue, Haut-Rhin (France)

Olympic Mountains

Olympic Mountains (Washington State)

Olympus

Omaheke Region

Omaheke Region (Namibia): geography, people, economy and administration

Oman

Oman: overview, geography, history, and culture of the Sultanate

Ombella-M'Poko

Ombella-M'Poko (prefecture of the Central African Republic)

Ōmi Province

Ōmi Province (Ōmi no kuni)

Omusati Region

Omusati Region (Namibia)

Onon (river)

Onon River (Mongolia and Russia)

Ontario

Ontario (province of Canada)

Ontario Highway 144

Ontario Highway 33

Ontario Highway 33 (King's Highway 33) — Loyalist Parkway

Ontario Lacus

Ontario Lacus — a hydrocarbon lake on Titan

Ontario Lacus is a large methane–ethane lake near Titan's south pole, identified by Cassini. It resembles Earth's Lake Ontario in size and shape and illustrates Titan's active orga

Onyx River

Onyx River — Antarctica’s longest seasonal meltwater stream

Opole Voivodeship

Orakzai District

Oran Province

Orange County

Orange County, Florida

Orange County, Texas

Orange River

Orange River (Oranje / Senqu)

Orangeburg County, South Carolina

Ordnance Survey National Grid

Ore Mountains

Oregon Territory

Öregrund

Öregrund — coastal town in Uppsala County, Sweden

Orient

Orient (term for the east)

Orinoco

Orinoco River: Geography, Ecology and Human Uses

Orion, Pyrénées-Atlantiques

Orion, Pyrénées-Atlantiques (commune in southwestern France)

Orne

Orne (department) — Normandy department of France

Oromia

Oromia Region, Ethiopia

Orsanco

Orsans, Aude

Ortac

Ortac (islet near Alderney)