Oklahoma

Old Gotham

Main location in Arkham Origins.

Oak Hill Country Club

Oak Hill Country Club, established in 1901, has hosted five major championship tournaments as well as the Ryder Cup in 1995. It is located in Pittsford, Pennsylvania.

Ohio

Ohio is the 17th state in the United States of America. It has the seventh highest population in the country.

Oolacile

An ancient civilization fallen to the Abyss.

Oa

Planet of the Green Lantern Corps

Oasis of Marr

The Oasis of Marr is located in the center of the Desert of Ro, and while it is no mirage, it is certainly not safe.

Oregon

Oregon is a state in the Pacific northwest of the United States. It was the 33rd state to be added to the Union and it's capital is Salem, while it's largest city is Portland.

Orphanage

A house for wayward children who are bereft of parentage.

Ohio Stadium

Also known as "The Horseshoe", Ohio Stadium is the home of the Ohio State Buckeyes football team.

Operation Metro

First multiplayer map from Battlefield 3.

Ottoman Empire

A vast empire that has risen to existence in 1299 and lasted till 1923. The Ottoman Empire contained 29 provinces. Constantinople was it's capital city.

Onsen

Traditional Japanese hot springs.

Olympus Coliseum

Hercule's home world from the Kingdom Heart series

Okinawa Penitentiary #2

A secret prison operated by Japanese government contractors in which the prison staff freely abuses the prisoners. In Yakuza 4, Taiga Saejima is transferred here as his execution date approaches.

Oakmont Country Club

Located just outside Pittsburgh, Pennsylvania, Oakmont Country Club has been the host to twelve major championships including nine U.S. Opens.

Oggok

Oggok is an ogre city in the jungles of southern Antonica. It is the starting city for all ogres in EverQuest.

Omar

A land in Darkstone realm

Orbis

A floating sky city in the MMORPG Maplestory. It is the location players arrive in when they first reach the continent of Ossyria.

Old Mormon Fort

The Old Mormon Fort is a location in Fallout: New Vegas. It was formerly the Old Las Vegas Mormon State Historic Park, and was the first building constructed in Las Vegas.

Ottawa

Ottawa is Canada's capital and the second largest city in the province of Ontario. Population wise, at 1,130,761 in its Metro Area, it is the 4th largest city in Canada. Ottawa is the home of the NHL's Senators and the OHL's 67's

Ocean of Origins

The third world of the Ark Arena in Chaos Rings.

Orlandes

Orlandes is a fantasy medieval setting, characterised by cobbled streets, beggars, and nobles. It is used in the Gamebook Adventures series of games.

Ossyria

One of the continents in MMORPG Maplestory. It is the largest continent in the game.

Oval Cricket Ground

Home of Surrey county cricket club, and home to the traditionally last Test match of the english summer.

Ontario

Home to 13 million citizens, Ontario is the largest province by population, and the second largest in area. Its capital city is Toronto. It is also the province in which the capital of the country is located, Ottawa.

Odus

Odus is a small continent in the world of Norrath.

Ouka

The continent on which the game Kingdom of Paradise takes place. The land is separated into five divisions controlled by clans each who protect one of five gates of natural chi.

Oedo Town

Goemon starts his adventure here in Mystical Ninja Starring Goemon. Highlights include Goemon's house, shops, a fortune teller, and the Emperor's castle.

Operating Room

A place where patients are under surgery.

Oni Island

An island fortress of demons ruled by the dark lord Ninetails. It's near impossible to reach, mysteriously changing locations overnight.

Oberon

The 4th moon of Uranus, it is the second largest of Uranus's moons and there is a chance that there is a layer of liquid water at the moon's core/mantle border.

Overlook

A firefight map in Halo: Reach. It is based on an area from the campaign level Winter Contingency.

Oceania

Oceania is a small continent composed of 15 countries.

Omegamatic

The Omegamatic is a death star Esc Destroyer featured in the Commander Keen series

Outskirts

The Outskirts of Vizima is the name of a small village built around the city of Vizima, it is where the first chapter of The Witcher takes place.

Obsidian Sanctum

The Black Dragonflight sector of the Chamber of Aspects, located beneath Wyrmrest Temple.

Omega

A space station built out of the remains of a metallic asteroid which is home to many criminals and mercenaries. Commander Shepard visits during the events of Mass Effect 2 to recruit people for his team.

Orbitus

The 6th planet Jazz visits. It is an elaborate structure of pipes, anti-gravity floors and bounce-walls.

Offshore Platform

A large structure stationed out at sea, where oil and/or natural gas is being extracted.

Ostagar

Ostagar is an abandoned fortress in the Dragon Age universe. It is most notable known as the location of the Battle of Ostagar.

Otsutsuki Village

Shiren the Wanderer's journey begins here, which serves as his base of operations for the rest of the game. Here, he may gather information from villagers, shop, and strengthen weapons and armour.

Overpass

This stage appears in Street Fighter IV / Super Street Fighter IV, and is set under an overpass in Tokyo, Japan.

Old Temple

This stage appears in Street Fighter IV / Super Street Fighter IV, and is set in an old temple, located in Japan.