Seoul, officially Seoul Special Metropolitan City, is both the capital city and largest city of South Korea, and the largest city in the whole of Korea. The broader Seoul Metropolitan Area, encompassing Seoul, Gyeonggi Province and Incheon, emerged as the world's sixth largest metropolitan economy in 2022, trailing behind New York, Tokyo, Los Angeles, Paris, and London, and hosts more than half of South Korea's population. Although Seoul's population peaked at over 10 million, it has gradually decreased since 2014, standing at about 9.6 million residents as of 2024. Seoul is the seat of the South Korean government.
Seoul's history traces back to 18 BC when it was founded by the people of Baekje, one of the Three Kingdoms of Korea. During the Joseon dynasty, Seoul was officially designated as the capital, surrounded by the Fortress Wall of Seoul. In the early 20th century, Seoul was occupied by the Empire of Japan, temporarily renamed "Keijō" ("Gyeongseong" in Korean). The Korean War brought fierce battles, with Seoul changing hands four times and leaving the city mostly in ruins. Nevertheless, the city has since undergone significant reconstruction and rapid urbanization.
Seoul was rated Asia's most livable city, with the second-highest quality of life globally according to Arcadis in 2015 and a GDP per capita (PPP) of approximately $40,000. 15 Fortune Global 500 companies, including industry giants such as Samsung, LG, and Hyundai, are headquartered in the Seoul Capital Area, which has major technology hubs, such as Gangnam and Digital Media City. Seoul is ranked seventh in the Global city and the Global Financial Centres Index, and is one of the five leading hosts of global conferences. Union of International Associations (UIA) International Meetings Statistics for the Year 2011 . Joel Fischer. The city has also hosted major events such as the 1986 Asian Games, the 1988 Summer Olympics, and the 2010 G20 Seoul summit, in addition to three matches at the 2002 FIFA World Cup.
Seoul is geographically set in a mountainous and hilly terrain, with Bukhansan positioned on its northern edge. Within the Seoul Capital Area lie five UNESCO World Heritage Sites: Changdeokgung, Hwaseong Fortress, Jongmyo, Namhansanseong, and the Royal Tombs of the Joseon dynasty. Furthermore, Seoul has witnessed a surge in modern architectural development, with iconic landmarks including the N Seoul Tower, the 63 Building, the Lotte World Tower, the Dongdaemun Design Plaza, Lotte World, the Trade Tower, COEX, IFC Seoul, and Parc1. Seoul was named the World Design Capital in 2010 and has served as the national hub for the music, entertainment, and cultural industries that have propelled K-pop and the Korean Wave to international prominence.
Wiryeseong (), the capital settlement of Baekje, was located within the boundaries of modern-day Seoul. Seoul was also known by other various historical names, such as Bukhansan-gun (, during the Goguryeo era), Namcheon (, during the Silla era), Hanyang (, during the Northern and Southern States period), Namgyeong (, during the Goryeo era), and Hanseong (, during the Joseon era). The word seoul was used colloquially to refer to the capital as early as the 17th century.Hendrick Hamel, a 17th-century Dutch sailor who was shipwrecked on Jeju Island, referred to the Joseon capital as Sior in his book "Hamel's Journal and a Description of the Kingdom of Korea, 1653–1666." Refer to the English translation of the book on this website created by Dr. Henny Savenije, a Dutch scholar known for his research on Hamel. Thus, the Joseon capital of Hanseong was widely referred to as the seoul. Due to its common usage, French missionaries called the Joseon capital Séoul (/se.ul/) in their writings, hence the common romanization Seoul in various languages today.
Under subsequent Japanese colonization, Hanseong was renamed as Keijō (京城, literally 'capital city') by the Imperial authorities to prevent confusion with the Hanja (a transliteration of a native Korean word ), which may also refer to the Han Chinese or the Han dynasty in Chinese and is associated with 'China' in Japanese context. After World War II and the liberation of Korea, Seoul became the official name for the Korean capital. The Standard Korean Language Dictionary still acknowledges both common and proper noun definitions of seoul''.
Unlike most place names in Korea, as it is not a Sino-Korean word, 'Seoul' has no inherently corresponding Hanja (Chinese characters used in the Korean language). Instead of phonetically transcribing 'Seoul' to Chinese, in the Sinophone world, Seoul was called Hànchéng (labels=no), which is the Chinese pronunciation of Hanseong. On 18 January 2005, the Seoul Metropolitan Government changed Seoul's official Chinese name from the historic Hànchéng to Shǒu'ěr (labels=no). Shǒu'ěr is a phono-semantic match incorporating both sound and meaning (through 首 meaning 'head', 'chief', 'first').
Due to modern Seoul's significant urbanization, Amsa-dong Prehistoric Site is the only known major archaeological site in Seoul where Stone Age materials have been found, although such materials have also been found in minor sites throughout the city (and all around the surrounding Han River basin), often through rescue archaeology.
Baekje (18 B.C. – 660 A.D.), once one of the statelets in the Mahan confederacy, became the dominant local power by the 2nd century A.D. Its capital was in Wiryeseong; Wiryeseong specific location is not known with certainty, but it is believed to have been within the bounds of the ramparts Pungnaptoseong and Mongchontoseong. This area is now in southeastern Seoul.
In November 555, Jinheung Taewang made a royal visit to Bukhansan, and inspected the frontier. In 557, Silla abolished Sin Province, and established Bukhansan Province (). The word Hanseong () appears on the stone wall of "Pyongyang Fortress", which was presumably built in the mid to late 6th century AD over period of 42 years, located in Pyongyang, while there is no evidence that Seoul had name Hanseong dating the three kingdoms and earlier period.
In 568, Jinheung Taewang made another royal visit to the northern border, visited Hanseong, and stayed in Namcheon on his way back to the capital. During his stay, he set Jinheung Taewang Stele, abolished Bukhansan Province, and established Namcheon Province (), appointing the city as the provincial capital. Based on the naming system, the actual name of Han River during this time was likely Namcheon (Nam River) itself or should have the word ending with "cheon" () not "gang" () nor "su" (). In addition, "Bukhansan" Jinheung Stele clearly states that Silla had possession of Hanseong (modern day Pyongyang), thus Bukhansan has to be located north of Hanseong. Modern day Pyongyang was not Pyongyang, Taedong River was likely Han River, and Bukhansan was not Bukhansan during the three kingdoms period. Moreover, Pyongyang was a common noun meaning capital used by Goguryeo and Goryeo dynasties, similar to Seoul.
In 603, Goguryeo attacked Bukhansanseong, which Silla ended up winning. In 604, Silla abolished Namcheon Province, and reestablished Bukhansan Province in order to strengthen the northern border. The city lost its provincial capital position and was put under Bukhansan Province once again. This further proves that Bukhansan was located in the North of modern-day Pyongyang as changing the provincial name and objective would not be required if Bukhansan was located within Seoul.
In the 11th century Goryeo, which succeeded Unified Silla, built a summer palace in Seoul, which was referred to as the "Southern Capital". It was only from this period that Seoul became a larger settlement.
The city of Hanyang was governed by the (), an agency of the national government dedicated to affairs on the administration of the capital city. The Hanseongbu divided Hanyang into two major categories: areas inside the Fortress Wall, which were typically named Seong-jung () or Doseong-an (), and areas 10 Ri (Korean mile) around the Fortress Wall, which were named as Seongjeosimni (). The Doseong-an area later gained the informal but popular name Seodaemun-an (), which literally means 'areas inside of the Four Great Gates', and became the one and only Downtown Seoul.
In the late 19th century, after hundreds of years of isolation, Seoul opened its gates to foreigners and began modernization. Seoul became the first city in East Asia to introduce electricity in the palace, which was established by the Edison Illuminating Company. A decade later the city also implemented electrical street lights.
Seoul was deprived of its special status as the capital city and downsized under imperial Japan, compared to the traditional notion among people of the Joseon dynasty that Seoul included the area of approximately radius surrounding the Fortress Wall (i.e., Seongjeosimni; ). On October 1, 1910, Imperial Japan demoted Seoul as no different than any other city within the Gyeonggi Province. After Imperial Japan's redistricting, Seoul only included the area inside the Fortress Wall and present-day Yongsan District. In the 1930s, as part of Imperial Japan's war efforts leading up to the Second Sino-Japanese War, Yeongdeungpo District was annexed into Seoul on April 1, 1936, to function as an industrial complex for steel and other metalworking factories.
The city was liberated by U.S. forces at the end of World War II.
Seoul under the U.S. military government between 1945 and 1948 was much smaller than it is today. It only covered the Fortress Wall, marked by the Eight Gates, and the districts incorporated during Japanese rule to prosecute imperial Japan's war efforts.
During the Korean War, Seoul changed hands between the Soviet- and Chinese-backed North Korean forces and the American-backed South Korean forces four times: falling to the North Koreans in the June 1950 First Battle of Seoul, recaptured by UN forces in the September 1950 Second Battle of Seoul, falling to a combined Chinese-North Korean force in the January 1951 Third Battle of Seoul, and finally being recaptured once more by UN forces in Operation Ripper during the spring of 1951. The extensive fighting left the city heavily damaged after the war. The capital was temporarily relocated to Busan. One estimate of the extensive damage states that after the war, at least 191,000 buildings, 55,000 houses, and 1,000 factories lay in ruins. In addition, a flood of refugees had entered Seoul during the war, swelling the population of the city and its metropolitan area to an estimated 1.5 million by 1955.
Following the war, Seoul began to focus on reconstruction and modernization. As South Korea's economy started to grow rapidly from the 1960s, urbanization also accelerated and workers began to move to Seoul and other larger cities. In 1963, Seoul went through two major expansions that established the shape and size of the present-day Seoul—barring minor adjustments to the borders later in 1973 and 2000. In August 1963, Seoul annexed parts of Yangju, Gwangju, Siheung, Gimpo, and Bucheon, expanding the northeastern borders of Seoul. In September, Seoul again annexed present-day Gangnam. The two consecutive expansions more than doubled the size of Seoul from approximately to .
After annexation, Gangnam's development was spurred by key infrastructure projects: the construction of the Hannam Bridge (1966–1969) and Gyeongbu Expressway (1968–1970). As Seoul's population kept growing, Park's regime focused its development plans on Gangnam. The main hurdle for Gangnam's development was floods because the area is low-lying and prone to flooding. Then Seoul mayor Kim Hyun-ok ordered construction of an expressway that doubled as embankment, which became the present-day Gangbyeonbuk-ro. The construction started in March 1967 and completed in September of the same year. Similar projects transformed previously flood-prone areas into usable land for development. Such areas include the current Ichon-dong, the Banpo-dong, Apgujeong-dong and Jamsil-dong.
Until 1972, Seoul was claimed by North Korea as its de jure capital, being specified as such in Article 103 of the 1948 North Korean constitution.
Seoul was the host city of the 1986 Asian Games and 1988 Summer Olympics as well as one of the venues of the 2002 FIFA World Cup.
South Korea's 2019 population was estimated at 51.71 million, and according to the 2018 Population and Housing Census, 49.8% of the population resided in the Seoul metropolitan area. This was up by 0.7% from 49.1% in 2010, showing a distinct trend toward the concentration of the population in the capital. Seoul has become the economic, political and cultural hub of the country, with several Fortune Global 500 companies, including Samsung, SK Holdings, Hyundai Group, POSCO and LG Group headquartered there.
There are also many parks along the Han River, such as Ichon Hangang Park, Yeouido Hangang Park, Mangwon Hangang Park, Nanji Hangang Park, Banpo Hangang Park, Ttukseom Hangang Park and Jamsil Hangang Park. The Seoul National Capital Area also contains a green belt aimed at preventing the city from Urban sprawl out into neighboring Gyeonggi Province. These areas are frequently sought after by people looking to escape from urban life on weekends and during vacations.
Since the early 1960s, the Ministry of Environment has implemented a range of policies and air pollutant standards to improve and manage air quality for its people. The "Special Act on the Improvement of Air Quality in the Seoul Metropolitan Area" was passed in December 2003. Its 1st Seoul Metropolitan Air Quality Improvement Plan (2005–2014) focused on improving the concentrations of PM10 and nitrogen dioxide by reducing emissions. 1st Seoul Metropolitan Air Quality Improvement Plan. Ministry of Environment, Republic of Korea. Retrieved 21 April 2017. As a result, the annual average PM10 concentrations decreased from 70.0 μg/m3 in 2001 to 44.4 μg/m3 in 2011 and 46 μg/m3 in 2014. As of 2014, the annual average PM10 concentration was still at least twice than that recommended by the WHO Air Quality Guidelines. The 2nd Seoul Metropolitan Air Quality Improvement Plan (2015–2024) added PM2.5 and ozone to its list of managed pollutants. 2nd Seoul Metropolitan Air Quality Improvement Plan. Ministry of Environment, Republic of Korea. Retrieved 21 April 2017.
Investment in air quality improvement between 2007 and 2020 in the order of US$9 billion on the part of three key local authorities, namely Gyeonggi, Incheon and Seoul, delivered a clear legal framework of responsibility, publicly checkable results and a major focus on reduction of transport pollutants. In July 2020, South Korea, then the 11th largest world economy, announced a US$35 billion position on ending investment in coal. In November 2020, South Korea committed to a carbon-neutral economy by 2050. Between 2005 and 2021 annual concentration levels of small particulate matter (PM10) fell by 30-40 % in Seoul, whilst concentrations of larger particulate matter (PM 2.5) in the same period fell by 19% across the country and more in Seoul and Gyeonggi.
Asian dust, emissions from Seoul and in general from the rest of South Korea, as well as emissions from China, all contribute to Seoul's air quality.Chung, Anna. "Korea's policy towards pollution and fine particle: a sense of urgency" . Korea Analysis. v2. June 2014. Retrieved 21 April 2017. Besides air quality, greenhouse gas emissions represent hot issues in South Korea since the country is among top-10 strongest emitters in the world. Seoul is the strongest hotspot of greenhouse gas emissions in the country and according to satellite data, the persistent carbon dioxide anomaly over the city is one of the strongest in the world. Air quality is monitored by geo-stationary satellite measurements centred on Korea and its immediate neighbours.Choi, Won Jun, Kyung-Jung Moon, Goo Kim, and Dongwon Lee. "Reliability Analysis Based on Air Quality Characteristics in East Asia Using Primary Data from the Test Operation of Geostationary Environment Monitoring Spectrometer (GEMS)." Atmosphere 14, no. 9 (2023): 1458.
The population of Seoul has been dropping since the early 1990s, with reasons including high costs of living, especially housing; urban sprawl to Gyeonggi region's satellite cities; and an aging population. Seoul also has an extremely low birth rate. In 2023, Seoul's fertility rate was recorded at 0.55, low even in comparison to the nationwide fertility rate of 0.72.
As of 2016, the number of foreigners living in Seoul was 404,037, 22.9% of the total foreign population in South Korea. As of June 2011, 186,631 foreigners were Chinese citizens of Korean ancestry. This was an 8.84% increase from the end of 2010 and a 12.85% increase from June 2010. The next largest group was Chinese citizens who were not of Korean ethnicity; 29,901 of them resided in Seoul. The next highest group consisted of the 9,999 United States citizens who were not of Korean ancestry. The next highest group were Taiwanese citizens, at 8,717.
Seoul is home to various specialized schools, including three science high schools, and six foreign language High Schools. Seoul Metropolitan Office of Education comprises 235 College-Preparatory High Schools, 80 Vocational Schools, 377 Middle Schools, and 33 Special Education Schools .
Seoul is home to the majority of South Korea's most prestigious universities, including the three SKY Universities: Seoul National University, Yonsei University and Korea University. Seoul ranked 2nd on the QS Best Student Cities 2023.
And in 2025, Seoul ranked 1st on the QS Best Student Cities 2026.
Seoul has three central business districts; the Downtown Seoul(CBD), Gangnam(GBD), and Yeouido(YBD). The Downtown Seoul, which has 600 years of history as unparalleled business district in entire Korea, is now a densely concentrated area around Gwanghwamun and Cheonggyecheon with headquarters of major companies, foreign financial institutions, largest news agencies and law firms. Other two business districts are developed in 1970s and have different characteristic; while Gangnam is well known for tech, luxury and private education industries, Yeouido is famous for securities exchange and asset management.
In 2023, the city announced plans to invest $44.7 million over six years to create a dedicated area to attract foreign investment.
Insadong is the cultural art market of Seoul, where traditional and modern Korean artworks, such as paintings, sculptures and calligraphy are sold. Hwanghak-dong Flea Market and Janganpyeong Antique Market also offer antique products. Some shops for local designers have opened in Samcheong-dong, where numerous small art galleries are located. While Itaewon had catered mainly to foreign tourists and American soldiers based in the city, Koreans now comprise the majority of visitors to the area. The Gangnam district is one of the most affluent areas in Seoul and is noted for the fashionable and upscale Apgujeong-dong and Cheongdam-dong areas and the COEX Mall. Wholesale markets include Noryangjin Fisheries Wholesale Market and Garak Market.
The Yongsan Electronics Market is the largest electronics market in Asia. Electronics markets are Gangbyeon station metro line 2 Techno mart, ENTER6 MALL & Shindorim station Technomart mall complex. Times Square is one of Seoul's largest shopping malls, and contains the world's largest permanent 35 mm cinema screen, the CJ CGV.
Korea World Trade Center Complex, which comprises COEX mall, congress center, 3 Inter-continental hotels, Business tower (Asem tower), Residence hotel, Casino and City airport terminal was established in 1988 in time for the Seoul Olympics. The 2nd World trade trade center is being planned at Seoul Olympic stadium complex as MICE HUB by Seoul. Ex-Kepco head office building was purchased by Hyundai motor group with 9billion USD to build 115-storey Hyundai GBC & hotel complex until 2021. Now ex-kepco 25-storey building is under demolition.
Seoul is among the world leaders in Internet connectivity, being the capital of South Korea, which has the world's highest fiber-optic broadband penetration and highest global average internet speeds of 26.1 Mbit/s. Since 2015, Seoul has provided free Wi-Fi access in outdoor spaces through a 47.7 billion won ($44 million) project with Internet access at 10,430 parks, streets and other public places. Internet speeds in some apartment buildings reach up to 52.5 Gbit/s with assistance from Nokia, and though the average standard consists of 100 Mbit/s services, providers nationwide are rapidly rolling out 1Gbit/s connections at the equivalent of US$20 per month. In addition, the city is served by the KTX high-speed rail and the Seoul Subway, which provides 4G LTE, Wi-Fi, and DMB inside subway cars. 5G will be introduced commercially in March 2019 in Seoul.
Seoul has many historical and cultural landmarks. In Amsa-dong, Gangdong District, neolithic remains were excavated and accidentally discovered by a flood in 1925.
Urban and civil planning was a key concept when Seoul was first designed to serve as a capital in the late 14th century. The Joseon dynasty built the "Five Grand Palaces" in Seoul—Changdeokgung, Changgyeonggung, Deoksugung, Gyeongbokgung and Gyeonghuigung—all of which are located in the Jongno and Jung Districts. Among them, Changdeokgung was added to the UNESCO World Heritage List in 1997 as an "outstanding example of Far Eastern palace architecture and garden design". The main palace, Gyeongbokgung, underwent a large-scale restoration project. UNESCO also recognizes Seoul as a "Design City."
Seoul has been surrounded by walls that were built to regulate visitors from other regions and protect the city in case of an invasion. Pungnap Toseong is a flat earthen wall built at the edge of the Han River, which is widely believed to be the site of Wiryeseong. Mongchontoseong is another earthen wall built during the Baekje period that is now located inside the Olympic Park. The Fortress Wall of Seoul was built early in the Joseon dynasty for protection of the city. After many centuries of destruction and rebuilding, about of the wall remains, as well as six of the original eight gates. These gates include the south gate Namdaemun and the east gate Dongdaemun. Namdaemun was the oldest wooden gate until a 2008 arson attack, and was re-opened after complete restoration in 2013.
The War Memorial covers the history of wars that Korea has been involved with, especially the Korean War. Seodaemun Prison is a former prison built during the Japanese occupation, and is used as a historic museum. The Seoul Museum of Art, Leeum, Samsung Museum of Art, and Ilmin Museum of Art are art museums in the city.
Seoul hosted the 1986 Asian Games, also known as Asian Games, 1988 Olympic Games, and Paralympic Games. It also served as one of the host cities of the 2002 FIFA World Cup. Seoul World Cup Stadium hosted the opening ceremony and first game of the tournament. Taekwondo is South Korea's national sport and Seoul is the location of the Kukkiwon, the world headquarters of taekwondo, as well as the World Taekwondo Federation.
Incheon International Airport opened in March 2001 in Yeongjong island. It is now responsible for major international flights. Incheon International Airport is Asia's eighth busiest airport in terms of passengers, the world's fourth busiest airport by cargo traffic, and the world's eighth busiest airport in terms of international passengers in 2014. In 2016, 57,765,397 passengers used the airport. Incheon International Airport opened terminal 2 on 18 January 2018.
Incheon and Gimpo are linked to Seoul by expressway, and to each other by the AREX to Seoul Station. Intercity bus services are available to various destinations around the country.
Air pollution inside the Metro system
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