South Korea, officially the Republic of Korea, occupies the southern part of the Korean Peninsula in Northeast Asia and covered about 100,460 square kilometres in 2024. Its only land frontier is with North Korea, separated by the Military Demarcation Line and the Demilitarized Zone; otherwise it faces the Yellow Sea to the west, the Korea Strait to the south, and the East Sea (Sea of Japan) to the east. Seoul, the capital, lies in the northwest on the Han River. Mountains dominate the interior: the Taebaek range runs close to the eastern coast, while the Sobaek system extends southwestward, leaving broader alluvial plains toward the west and south. The Han, Geum, Nakdong, and Yeongsan river basins contain much of the country’s farmland and urban development. Jeju, the largest island, is volcanic and dominated by Hallasan, while the deeply indented southern and western coasts contain numerous islands, bays, estuaries, and tidal flats.
Climate varies sharply with latitude, elevation, and exposure to continental and maritime air masses. Winters are generally cold and comparatively dry under northwesterly airflow from the Asian continent, with more severe conditions inland and in higher mountains; Jeju and the southern coast are milder. Summers are hot, humid, and dominated by the East Asian monsoon. The jangma rainy season brings concentrated early-summer rainfall, and tropical cyclones can affect the peninsula later in summer and early autumn. Long-term climatological averages place a large share of annual precipitation in summer, making reservoirs, river regulation, and flood-control systems important despite relatively abundant yearly rainfall. Mountain barriers create further local differences in snowfall and precipitation. Environmental pressures include heatwaves, intense downpours, river and urban flooding, drought, wildfire, and coastal storm surge, all amplified in consequence by dense settlement and infrastructure. Korean climate planning increasingly treats extreme heat and heavy precipitation as central adaptation risks.
Forests remain the dominant land cover outside built-up and cultivated lowlands. Korea Forest Service statistics for 2020 recorded about 6.3 million hectares of forest, roughly 63 percent of national territory, reflecting a major postwar reforestation effort that restored degraded hillsides and greatly increased timber volume. Agriculture is concentrated in western and southern plains and river basins where flatter terrain, irrigation, and market access favor rice, vegetables, fruit, livestock, and greenhouse production; mountainous counties have much less cultivable land. The Yellow Sea and southern shoreline support mudflats, estuaries, fisheries, and migratory-bird habitat, while Jeju adds volcanic and subtropical ecological zones. South Korea had 23 national parks in 2024, and UNESCO-listed natural properties include Jeju Volcanic Island and Lava Tubes and the Getbol tidal flats. Dense urbanization, transport corridors, habitat fragmentation, forest fires, and changing agricultural demographics continue to pressure these landscapes.
Human settlement on the peninsula extends deep into prehistory, but the political traditions later associated with Korea emerged through successive states rather than a single continuous nation-state. Gojoseon is the earliest polity prominent in Korean historical tradition, followed by competing kingdoms and confederacies. During the first millennium CE, Goguryeo, Baekje, and Silla became the principal Three Kingdoms, alongside Gaya polities in the south. Silla, allied with Tang China, eventually controlled most of the peninsula south of Balhae, creating a more integrated political and cultural sphere. Goryeo, founded in 918, later reunited most of the peninsula; its name is the historical source of “Korea,” and its Buddhist culture developed amid extensive regional contacts and later Mongol domination. Joseon, founded in 1392, built a centralized Neo-Confucian state and bureaucracy. Under King Sejong, the script now called Hangul was completed in the 1440s and promulgated in 1446. Japanese invasions in the 1590s, Manchu invasions in the seventeenth century, and mounting nineteenth-century pressure from imperial powers progressively transformed the kingdom’s strategic environment.
Japan formally annexed Korea in 1910 and ruled the peninsula until its defeat in 1945. Colonial government reshaped landholding, industry, education, language policy, and labor while subordinating development to the Japanese empire; resistance included the March First Movement of 1919, overseas independence organizations, and armed activity. Liberation did not produce reunification. Soviet and American occupation zones divided the peninsula, separate governments were established in 1948, and the Korean War of 1950–53 devastated both states before an armistice created the enduring military division without a peace treaty. In the South, reconstruction was followed by authoritarian rule, a 1961 military coup, state-directed industrialization, and rapid export growth. Democratic opposition survived repeated repression, including the violent suppression of the Gwangju uprising in 1980, and mass mobilization in June 1987 produced constitutional reform and direct presidential elections. The democratic order has since endured changes of government, economic crises, and impeachment. A brief declaration of martial law in December 2024 was rejected by parliament within hours; the Constitutional Court removed the president in April 2025, and a snap election followed under the existing constitutional framework.
South Korea is a high-income, export-oriented economy in which services account for most output and employment while advanced manufacturing remains unusually important. World Bank data put GDP at about US$1.87 trillion in 2025, or roughly US$36,200 per person, while real growth slowed to 1.0 percent; the IMF’s July 2026 update projected 2.6 percent growth for 2026. Semiconductors, automobiles, ships, machinery, petrochemicals, batteries, displays, and electronics anchor merchandise trade, and annual exports exceeded US$700 billion for the first time in 2025. China and the United States are major markets, with ASEAN, the European Union, Japan, and other Asian economies also embedded in Korean supply chains. Limited domestic oil and gas resources make the country heavily dependent on imported energy and raw materials. Large conglomerates remain central to industrial investment, but productivity gaps between globally competitive manufacturers and many smaller firms and service businesses persist. Population ageing, labor-market segmentation, household financial pressures, and weak domestic demand complicate the relationship between export strength and household economic security.
The 2024 Population and Housing Census counted 51.81 million residents, while Statistics Korea’s 2026 projection is about 51.61 million, indicating that national population growth has effectively ended. Density was about 515 people per square kilometre in 2024, but settlement is highly uneven because mountains occupy much of the interior. The Seoul Capital Area—Seoul, Incheon, and Gyeonggi Province—contained 26.31 million people in 2024, 50.8 percent of the total, concentrating headquarters, universities, high-value services, and transport investment. Busan is the principal southeastern port metropolis; Daegu, Daejeon, Gwangju, and Ulsan are major regional centers, while Sejong houses many central-government ministries. MOLIT reported an urbanization rate of 92.1 percent in 2024. The country has 17 first-tier local governments, including Seoul, six metropolitan cities, Sejong, provinces, and three special self-governing provinces. Ageing is rapid: people aged 65 or over represented 19.5 percent of residents in the 2024 census, while the 2025 total fertility rate was 0.800.
Korean is the overwhelmingly dominant language of government, education, and mass media, written primarily in Hangul; regional varieties remain significant, and Jeju speech is especially distinctive. The Hunminjeongeum manuscript explains the alphabet promulgated in 1446 and is listed by UNESCO’s Memory of the World programme. South Korea has no state religion, and religious affiliation is plural: Buddhism remains connected to historic temples, monastic institutions, and artistic traditions, while Protestant and Catholic Christianity expanded through missions, education, urbanization, and social organization; non-affiliation is also widespread. Cultural life reflects these layered histories. Confucian ideas influenced family, schooling, scholarship, and ritual, while pansori narrative singing, ceramics, calligraphy, literature, architecture, and regional folk traditions remain important cultural forms. Highly commercialized film, television, popular music, gaming, and webtoons have meanwhile become internationally visible cultural industries. Their growth reflects the broader transformation toward an urban, educated, digitally connected society rather than a break with Korea’s earlier cultural history.
Transport infrastructure is dense along the main urban and industrial corridors. MOLIT reported 116,012 kilometres of roads in 2024, including 5,151 kilometres of expressways, and 5,315 kilometres of railway. High-speed KTX and SRT services connect Seoul with Busan, the southwest, and other major cities, while metropolitan rail is concentrated most heavily in the capital region. Busan is the dominant container gateway: the port handled about 24.9 million TEU in 2025, more than half as transshipment cargo, giving it a major role in Northeast Asian shipping. Incheon International Airport is the principal long-haul aviation hub, supplemented by Gimpo and regional airports. The power system had roughly 156.6 GW of installed generating capacity in 2025 and combines nuclear energy, gas, coal, and expanding renewable capacity; World Bank data record universal electricity access in 2024. Fixed and mobile broadband networks are highly developed, but rural counties and islands generally have thinner public-transport services than the Seoul metropolitan area.
South Korea’s regional importance derives from the interaction of security geography and industrial connectivity. It remains divided from nuclear-armed North Korea along a heavily militarized frontier and is linked to the United States by the 1953 Mutual Defense Treaty, while its manufacturers and ports are tightly integrated with China, Japan, the United States, ASEAN, and global technology supply chains. The republic joined the United Nations in 1991 and participates in the OECD, G20, and APEC; hosting APEC in Gyeongju in 2025 highlighted its role in debates over trade, artificial intelligence, and demographic change. Busan and the Korea Strait connect Korean industry to major Pacific sea routes, yet export dependence leaves growth exposed to protectionism and supply-chain fragmentation. Its medium-term weight will depend on whether strengths in semiconductors, shipbuilding, batteries, digital technology, and energy engineering can generate broader productivity gains while the country manages rapid ageing, capital-region concentration, imported-energy dependence, climate risk, and persistent security tension.
