Jeju Island

Jeju Island (제주도) is South Korea’s largest island and a leading tourist and cultural destination, located approximately 100 kilometers southwest of the mainland in the Korea Strait. Formed by volcanic activity and dominated by Hallasan, a dormant volcano and UNESCO World Heritage Site, Jeju is renowned for its distinctive natural landscape, independent spirit, and complex history as both a tourist haven and a site of historical trauma. The island constitutes its own special self-governing province (제주특별자치도) and represents a unique blend of natural beauty, mythological significance, maritime culture (haenyeo women divers), and modern development. Jeju receives approximately 15 million visitors per year in normal years and is the top destination for South Korean domestic honeymoon trips.

Geography and Geology

Jeju Island covers approximately 1,849 square kilometers, making it South Korea’s largest island. The island’s distinctive landscape is shaped entirely by volcanic geology. Hallasan (한라산, “Mount Halla”), at 1,947 meters, is the highest mountain in South Korea and the focal point of the island’s identity. Hallasan is a shield volcano that erupted most recently in 1007 CE and is now dormant. Its crater contains a small lake (Baekrokdam), and the mountain’s slopes are covered with diverse subtropical and temperate vegetation zones, sheltering over 1,800 plant species and 3,300 animal species. Hallasan was designated a UNESCO Natural World Heritage Site in 2007.

The island’s coastline is dramatic, featuring steep cliffs (daepo), black-sand beaches formed from volcanic basalt, and distinctive rock formations. Notable coastal features include Seongsan Ilchulbong (성산일출봉, “Sunrise Peak”), a tuff cone rising 182 meters above sea level, formed by an underwater volcanic eruption approximately 5,000 years ago. Seongsan Ilchulbong, also a UNESCO Natural World Heritage Site since 2007, draws visitors for its celebrated dawn sunrise views from the rim caldera. Also part of the 2007 UNESCO listing are the Geomunoreum Lava Tube System, a network of interconnected caves including Manjangul Cave (만장굴). Manjangul, approximately 7.4 kilometers long and up to 23 meters high, is one of the longest lava tubes in the world and contains a 7.6-meter lava column (the world’s largest). The entire Jeju Volcanic Island and Lava Tubes complex, designated in 2007, was also recognized as a UNESCO Global Geopark in 2010.

Jeju’s climate is subtropical and humid, milder than the mainland, with mild winters averaging around 5–8°C and warm summers averaging 25–28°C. The island experiences typhoons during late summer, and its position in the strait makes it vulnerable to sudden weather shifts. The mild climate enables the cultivation of subtropical crops including Jeju’s famous tangerines (hallabong, 한라봉), green tea, and subtropical fruits that cannot be grown on the mainland.

Mythological and Cultural Significance

Jeju holds a central place in Korean mythology and folklore. According to Jeju creation mythology, the island was populated by three divine clans—Goh (高), Yang (梁), and Bu (夫)—who emerged from the ground at Samseonghyeol (삼성혈, “Three Clans’ Holes”), a sacred site still preserved in Jeju city, and initially lived as hunter-gatherers before adopting agriculture. This founding myth, encoded in the oral epic tradition, establishes Jeju as cosmologically distinct from the mainland.

The island’s indigenous mythology is intertwined with the cult of the sansin (mountain spirit) and numerous local deities associated with natural features. Traditional Jeju religion (musok, 무속), now largely preserved in museums and cultural performances, reflects pre-Buddhist indigenous shamanism that persisted longer on Jeju than on the mainland. The island boasts the most active shamanic ritual (gut) culture in South Korea, with over 18,000 deities (sinji) identified in the local mythology.

The island is also the birthplace of the haenyeo (해녀, “sea women”) tradition. These breath-hold diving women—traditionally ranging in age from 40 to over 80—have practiced subsistence and commercial diving for at least 1,500 years, harvesting abalone, sea cucumber, urchin, seaweed, and other marine products without air tanks. At their peak in the 1960s, approximately 26,000 haenyeo operated in Jeju waters; today, roughly 3,500 remain, with the average age exceeding 65. UNESCO inscribed the haenyeo culture on the Representative List of Intangible Cultural Heritage of Humanity in November 2016. The haenyeo represent a rare gendered maritime economy in which women hold economic power and control resource access, and are supported by communal diving collectives (bulteok). Diving songs (sung between dives to maintain rhythm and prevent hyperventilation) are part of haenyeo cultural practice. Despite declining numbers, haenyeo remain iconic symbols of Jeju resilience and female agency.

Jeju’s indigenous dialect, Jejueo (제주어), is distinct enough from standard Korean to be considered a separate language by UNESCO, which classified it as a “critically endangered” language in 2010. The language retains archaic Korean vocabulary and unique grammatical structures not found in mainland Korean, and is spoken primarily by the elderly. Cultural preservation efforts include school programs and audio documentation projects.

Historical Development

Pre-Modern Jeju

Jeju’s early history is less documented than the mainland, but the island was settled by hunter-gatherers from at least the Neolithic period. The mythological founding legend places Jeju outside the direct control of Korean kingdoms, though it traded with and was influenced by mainland dynasties. The Tamna Kingdom (탐라국), Jeju’s indigenous polity, maintained semi-independence for centuries, paying tribute to mainland kingdoms while preserving its own royal line. The Tamna kingdom formally submitted to the Goryeo Dynasty around 938 CE.

During the Goryeo period (918–1392), Jeju came under Korean state control but maintained a semi-autonomous status. Under the Mongol Empire’s domination of Korea (1231–1356), the Mongols established horse-breeding stations on Jeju’s flatlands, and the island served as a base for Mongol military operations. Mongol cultural influence, particularly in horse culture and certain dialect features, persisted on the island.

During the Joseon period (1392–1910), Jeju was increasingly integrated into the Korean state hierarchy and administered as a province. The island’s relative isolation fostered a distinct local identity, dialect, and cultural practices. The Joseon government used Jeju as a place of exile for political prisoners and dissidents, and notable exiles included the scholar Chusa Kim Jeong-hui (김정희), who produced major calligraphic works during his Jeju exile in the 1840s.

Japanese Colonial Period and the April 3 Incident

Jeju Island’s modern history is marked by the April 3 Incident (4·3 사건), one of South Korea’s deadliest and most contested historical traumas. Following the 1945 liberation from Japanese colonial rule, Jeju became a focal point of left-right tensions during the division and early Cold War. Jeju’s proximity to Japan, its significant returning-diaspora population (Zainichi Koreans who returned from wartime Japan), and its left-leaning labor movement made it a flashpoint.

On April 3, 1948, an armed rebellion erupted on Jeju in response to harsh conscription policies, economic hardship, and abusive conduct by U.S.-backed police and youth organizations. Left-leaning groups, including the South Korean Labor Party (SKLP), led the uprising against the U.S. military government and the Korean security forces. What began as a localized protest escalated into a full-scale counter-insurgency campaign lasting into 1954. South Korean military and police forces, viewing the rebellion through a Cold War lens, conducted brutal suppression operations that included burning entire villages, mass executions, and forced relocations. The official death toll established by the 2003 government investigation exceeds 25,000, with some estimates reaching 30,000—approximately 10% of the island’s total population at the time.

The April 3 Incident was officially labeled a “communist rebellion” and suppressed from historical discourse for nearly 50 years under successive authoritarian governments. Victims and their families were socially ostracized and denied government employment. The 4·3 Peace Park and Memorial Hall, opened in Jeju city in 2008, now commemorate the victims with the names of over 14,000 identified dead and missing. The Special Act on the April 3 Incident (2000) established the official government investigation, and President Roh Moo-hyun became the first sitting president to formally apologize for the state’s role, in October 2003. April 3 is now a national day of remembrance, and the 4·3 Commission continues identifying victims.

Post-War Development and Tourism

In the 1960s–1970s, Jeju transformed from an impoverished rural island into a tourist destination under President Park Chung-hee’s development agenda. Tourism infrastructure investment, including the 1968 opening of Jeju International Airport, connected the island to mainland domestic routes. The establishment of Jeju Free International City (제주국제자유도시) in 2002 and the island’s subsequent designation as a Special Autonomous Province in 2006 accelerated economic diversification. The 2006 Special Autonomous Province law gave Jeju unique administrative powers, tax incentives for business investment, and authority to negotiate some international trade relationships independently.

Modern Jeju Island developed into South Korea’s premier domestic tourist destination, drawing over 15 million visitors annually (pre-COVID). Major attractions include:

• Hallasan National Park — hiking, botanical diversity, and crater lake
• Seongsan Ilchulbong — sunrise viewing and distinctive tuff-cone geology
• Manjangul Lava Cave — a UNESCO-listed lava tube of approximately 7.4 km
• O’Sulloc Tea Museum and Plantations — green tea culture and agritourism, established 1979 by Amorepacific founder
• Jeju Haenyeo Cultural Center — cultural heritage preservation and live diving demonstrations
• Samseonghyeol Shrine — mythological foundation site of the Three Clans
• Jeju 4·3 Peace Park — historical trauma commemoration and reconciliation
• Jeongbang Waterfall (정방폭포) — one of the few waterfalls in Asia that falls directly into the sea

The tourism economy transformed Jeju’s demographics, attracting mainland migrants and international residents. By 2020, Jeju’s population had grown to approximately 675,000, up from 400,000 in the 1980s, driven largely by mainlanders seeking affordable island life. Rapid development raised environmental concerns, including pressure on volcanic groundwater (Jeju’s sole freshwater source), coastal degradation, and strain on UNESCO-designated natural areas.

Contemporary Jeju

Jeju Naval Base Controversy

The construction of the Jeju Naval Base (제주해군기지) in Gangjeong village on the island’s southern coast became a major environmental and political controversy spanning 2007–2016. The base, designed to homeport destroyers and submarines, was sited adjacent to the Gureombi Rock, a stretch of UNESCO-recognized coastline in the marine biosphere reserve. Protests—including a continuous 1,900-day demonstration (2007–2012) by villagers, civil society groups, and international activists—failed to stop construction. The base was completed in February 2016 and officially opened in May 2016. Critics argued the base escalated military tensions in the region and permanently damaged the UNESCO marine environment; the government argued it was essential for South Korean naval defense and to monitor Chinese naval activity.

Environmental Challenges

Jeju’s volcanic basalt geology creates a porous substrate that makes the island’s groundwater vulnerable to contamination. The island relies entirely on underground volcanic aquifers (groundwater from the basalt) for freshwater. Tourism-driven development—hotels, golf courses, theme parks, and residential developments—increases both demand and contamination risk for this resource. The designation as a Special Autonomous Province, while promoting economic development, simultaneously granted the provincial government stronger environmental regulation powers, creating ongoing tension between development and preservation.

Jeju’s haenyeo economy faces decline as younger generations pursue mainland education and employment. Cultural preservation initiatives, including the 2016 UNESCO inscription and government subsidies for elderly haenyeo, attempt to sustain the tradition. The Jeju Haenyeo School program, offering diving certifications to non-Jeju women, seeks to expand participation, though numbers continue to decline.

Politics and Regional Identity

Jeju’s political culture is distinctly progressive. The island has been a reliable stronghold of the Democratic Party (and predecessor progressive parties) in presidential and parliamentary elections, reflecting both historical grievance (April 3 victims aligned against conservative governments that denied the incident) and the island’s autonomous, independent identity. In presidential elections, Jeju consistently delivers some of the highest progressive vote shares outside the Jeolla region. The April 3 remembrance has made Jeju a powerful symbol of historical justice and state accountability in South Korean political discourse, frequently invoked in campaigns by democratic candidates including Moon Jae-in, who visited the 4·3 Memorial during his 2017 campaign.

Modern Economy

Jeju’s economy is dominated by tourism (~30% of GDP), agriculture (especially tangerine cultivation—the hallabong variety is Jeju’s most famous agricultural brand—and haenyeo-harvested marine products), and fishing. The Free International City designation attracted shopping complexes, duty-free shops, casinos (open to foreigners only), golf courses, and luxury resort developments. Jeju is one of the few places in South Korea where foreigners can own land under certain conditions, making it a target for Chinese real-estate investment; a 2010s wave of Chinese investment raised concerns over land speculation and foreign ownership of scenic areas.

The tourism economy is vulnerable to external shocks. During the 2016–2017 THAAD missile defense dispute between South Korea and China, Chinese group-tour restrictions caused an estimated 15–20% decline in Jeju visitor numbers, and COVID-19 (2020–2022) similarly disrupted tourism revenue. The experience accelerated efforts to diversify toward higher-value eco-tourism and cultural tourism less dependent on mass Chinese group travel.

Related

• Korean Independence Movement — The anti-colonial struggle whose post-liberation aftermath produced the Jeju April 3 Incident
• Japanese Colonial Period — Colonial-era ties to Japan and the returning diaspora that shaped Jeju’s postwar politics
• Korean War — The Cold War division that framed the 1948–1954 suppression on the island
• Moon Jae-in — Progressive president who invoked the April 3 legacy of state accountability
• Seoul — The mainland capital against which Jeju’s autonomous provincial identity is defined
• Busan — The nearest mainland metropolis and the principal gateway to the island
• Hallyu — the Korean Wave — Jeju as a filming and tourism backdrop within Korea’s cultural export economy
• Incheon — The mainland gateway whose international airport is a principal hub for flights to and from Jeju
• Tourism Industry in South Korea — The national tourism sector for which Jeju is the single leading destination