All articles starting with O

Oudemans (Martian crater)

Oudemans is a 124-km-diameter central-peaked impact crater on Mars at the western end of Valles Marineris, Sinai Planum; IAU-named 1973 for Jean A. Oudemans, it pre-dates Noctis Labyrinthus and Ius Chasma.

Oudenburg

Oudenburg (Aldenborg) Roman coastal fort, West Flanders, Belgium: five fort periods from the late 2nd to early 5th century AD, Saxon Shore castellum with stone fort of the 260s, reoccupied after 379/380, abandoned around 410.

Sep 23, 2026

Oudh

Oudh, also spelled Awadh (اودھ), was a North Indian state founded in 1722 under Mughal governor Saadat Khan, ruled from Lucknow until British annexation in 1856.

Oudh State (ریاست اودھ)

Oudh State, also known as Awadh or the Kingdom of Oudh (ریاست اودھ), was a North Indian state ruled by nawabs from Lucknow until British annexation in 1856.

Sep 23, 2026

Oudh Taluqdari Settlement

The Oudh Taluqdari Settlement was the 1859 British arrangement confirming Oudh's taluqdars as permanent, hereditary, and transferable proprietors by sanad, reversing the March 1858 confiscation.

Oued Cherrat

Oued Cherrat is a river on Morocco's Atlantic coast near Bouznika, roughly midway between Rabat and Casablanca, whose mouth forms a beach and reef surf break.

Ouémé Department

Ouémé Department (Département de l'Ouémé), a department of Benin in the southeast, area 1,281 km², nine communes including Porto-Novo, the national administrative capital; 1,100,404 inhabitants at the 2013 census; named for Benin's longest river.

Oueme Lower Valley Biosphere Reserve

Oueme Lower Valley Biosphere Reserve (RB-BVO), Benin: UNESCO MAB site designated 2020 on the south-eastern Atlantic coast, a Dahomey Gap wetland of 333,721 ha with 2.3 million people, mangroves, manatees and stilt villages.

Ōuetsu Reppan Dōmei

The Ōuetsu Reppan Dōmei (奥羽越列藩同盟) was a military alliance of 31 domains in northeastern Japan, formed in 1868 during the Boshin War to resist the Meiji government.

Ouga

Ouga (五友歌, "Song of Five Friends") is a cycle of six sijo poems by the Joseon poet Yun Seondo praising water, rock, pine, bamboo, and the moon.

Ouham

Ouham is a prefecture of the Central African Republic in the northwest, capital Bossangoa, part of Yadé Region, named after the Ouham (Bahr Sara) River, a Chari tributary and key agricultural basin.

Ouham-Pendé Prefecture

Ouham-Pendé is a prefecture of the Central African Republic in the northwest, capital Bozoum, on the Chad and Cameroon borders. Known for the 3R armed group, transhumance, artisanal mining, and the 2022 Lim-Pendé split.

Ouida

Ouida, pen name of Maria Louise de la Ramée (1839–1908), English Victorian novelist of Under Two Flags and Moths; coined "the New Woman" in her 1894 essay; also a libertarian journalist in Italy.

Ouidah

Ouidah is a town in southern Benin that served for nearly two centuries as the main embarkation point of the Atlantic slave trade on the Slave Coast.

Ouija

Ouija, a talking board or spirit board patented in 1891 by Elijah Bond and made by Kennard Novelty, spells messages via a planchette moved by the ideomotor effect; later owned by William Fuld, Parker Brothers, and Hasbro.

Ouija (2014 film)

Ouija is a 2014 American supernatural horror film directed by Stiles White, starring Olivia Cooke as a teenager whose spirit board contacts a hostile entity.

Ouija: Origin of Evil

Ouija: Origin of Evil, also known as Ouija 2, is a 2016 American supernatural horror film directed by Mike Flanagan and set in 1960s Los Angeles.

Ouistreham

Ouistreham (Riva-Bella) is a Calvados commune in Normandy at the Orne mouth, port of Caen and French terminus of the Portsmouth ferry; 9,212 inhabitants (2023), fishing port, seaside resort, coastal-flood risk management.

Oujda

Oujda (وجدة), also Oudjda, is a city in northeastern Morocco, capital of the Oriental region near the Algerian border. Founded around 994 by Ziri Ibn Attia; 506,224 inhabitants (2024 census); border closed since 1994.

Oujda and Casablanca riots of 1953

The Oujda and Casablanca riots of 1953 were anti-French demonstrations and armed actions in Morocco on 15–16 August 1953, shortly before the French deposed Sultan Mohammed V.

Oujda-Angad

Oujda-Angad (عمالة وجدة-أنكاد) is an urban prefecture in Morocco's Oriental region, capital Oujda, near the Algerian border; 572,454 inhabitants (2024), 1,488 km², regional administrative and university hub.

Ouk Chatrang

Ouk Chatrang (អុកចត្រង្គ), also Ouk Chaktrang or Khmer chess, is Cambodia's traditional chess, a Makruk-family 8×8 game with pawns on the third rank and one-time knight-jump (king) and double-step (met) first moves.

Oukitel

Oukitel is a Chinese consumer electronics brand based in Shenzhen, owned by Shenzhen Yunji Intelligent Technology, known for rugged smartphones with very large batteries, tablets, and power stations.

Sep 19, 2026

Ouku

Ouku (欧酷网) was a Shanghai-based B2C e-commerce site selling mobile phones and electronics, founded in 2007 by Huang Zheng, a former Google China engineer, and sold to LightInTheBox in 2010.

Oukwanyama

Oukwanyama, also called Kwanyama, was the largest precolonial Ovambo kingdom in northern Namibia and southern Angola; its last king, Mandume ya Ndemufayo, died in 1917.

Oula New Materials (欧莱新材)

Oula New Materials (欧莱新材; Guangdong Oulai High-tech Materials Co., Ltd.) is a Chinese maker of sputtering targets for flat-panel displays, founded in 2010 and listed on the STAR Market.

Oulanka National Park

Oulangan kansallispuisto (Oulanka National Park), a 1956 Finnish national park in Kuusamo and Salla, protects the free-flowing Oulankajoki and Kitkajoki rivers, calcareous-rich biodiversity, and the 82 km Karhunkierros Trail; Ramsar site 1525 and Natura 2000 FI1101645.

Oulipo

Oulipo (Ouvroir de littérature potentielle), French workshop of writers and mathematicians founded 1960 by Raymond Queneau and François Le Lionnais; explores potential literature through formal constraints such as N+7 and the lipogram; still active with about forty coopted members.

Oulu

Oulu (Uleåborg), city on Finland's Gulf of Bothnia coast at the Oulujoki mouth, founded 1605 by Charles IX. Tar and salmon port, provincial capital since 1776, university and 6G technology hub, European Capital of Culture 2026.