Sri Lanka occupies 65,610 square kilometres in South Asia, forming an island in the northern Indian Ocean immediately southeast of the Indian peninsula. It has no land borders: the shallow Palk Strait and Palk Bay separate its north from Tamil Nadu, while the Gulf of Mannar lies to the northwest and open ocean surrounds the south and east. The island extends about 432 kilometres north to south and 224 kilometres at its widest. Its physical structure is dominated by the south-central Central Highlands, where Pidurutalagala reaches 2,524 metres, enclosed by broad lowlands covering roughly two-thirds of the country. These plains widen across the dry north and east, while the Jaffna Peninsula projects into the Palk region. More than a hundred natural stream basins drain the island; the Mahaweli Ganga forms the largest river system. Sri Jayawardenepura Kotte, the capital and seat of Parliament, adjoins Colombo, the principal commercial and port city on the west coast.
Sri Lanka’s climate is tropical but strongly differentiated by monsoon exposure and elevation. The southwest monsoon from May to September brings the heaviest rain to the southwest and windward Central Highlands, while the northeast monsoon from December to February is more important across the north and east; two intermonsoon periods produce widespread convection. Average annual rainfall is about 2,000 millimetres nationally, but local totals range from under 1,000 millimetres in the driest northwestern and southeastern zones to more than 5,000 millimetres on some southwestern mountain slopes. Lowland mean annual temperatures are around 27.5°C, whereas Nuwara Eliya in the highlands averages roughly 16°C. The result is a humid wet zone in the southwest, a much larger seasonally dry zone across much of the north, east and southeast, and an intermediate belt between them. Floods and landslides recur in wetter terrain, while drought, water stress, erosion and coastal change place pressure on farming, reservoirs and settlements elsewhere.
These environmental divisions support exceptional endemism and several sharply different ecosystems. Remnants of lowland tropical rainforest survive in the southwest, especially at Sinharaja, while the Central Highlands contain montane forest and grassland in Horton Plains, the Knuckles Conservation Forest and Peak Wilderness. Dry monsoon forest, scrub and reservoir landscapes dominate much of the north-central and southeastern interior, and mangroves, lagoons, seagrass beds and coral systems occur around parts of the coast. Parks including Yala, Wilpattu, Udawalawe and Minneriya protect large mammals, birds and reptiles, although habitat fragmentation and human-elephant conflict remain major conservation problems. Land use follows rainfall and water availability: rice is central to irrigated lowland agriculture, tea to the cooler highlands, rubber to the humid southwest, and coconut to broad lowland belts. Ancient tanks and modern Mahaweli irrigation have sustained intensive cultivation in seasonally dry areas, but soil erosion, forest degradation and variable rainfall complicate long-term land management.
Human occupation reaches deep into prehistory, but the political geography visible in written and archaeological evidence developed during the first millennium BCE. Anuradhapura became the center of a long-lived kingdom whose rulers built extensive reservoirs and canals; irrigation supported rice surpluses, urban growth and powerful Buddhist monasteries. Buddhism took durable institutional form after contact with the Mauryan world in the third century BCE, while trade linked the island to southern India and wider Indian Ocean networks. Political authority shifted repeatedly after invasions and dynastic change. Chola power from southern India occupied much of the island around the turn of the second millennium, and Polonnaruwa became a major royal center before later courts moved southwest. By the late medieval period, a Tamil kingdom was established around Jaffna, while the Kandyan kingdom controlled the central uplands. Arab and other Muslim merchants helped establish coastal trading communities. Portuguese fleets arrived in the early sixteenth century, turning competition over ports, cinnamon and alliances with local rulers into sustained European intervention.
European control remained incomplete until the nineteenth century. The Portuguese built a fortified coastal system and promoted Catholic missions, but the Dutch East India Company displaced them from their remaining strongholds by the mid-seventeenth century and reorganized the maritime provinces around commerce, cinnamon and taxation. Britain seized the Dutch-held coast in 1796 and, after the fall of the Kandyan kingdom in 1815, became the first colonial power to govern the island as one territorial unit. British rule expanded coffee and, after coffee blight, tea and rubber plantations; large numbers of Tamil workers were brought from southern India to the central estates, while roads and railways linked plantation districts to Colombo. Ceylon became independent on 4 February 1948. Post-independence citizenship laws and Sinhala-language nationalism deepened Tamil grievances; the republic of Sri Lanka was established in 1972, and the 1978 constitution created a powerful executive presidency. War between the state and the Liberation Tigers of Tamil Eelam lasted from 1983 to 2009, alongside other insurgencies. The 2022 debt and balance-of-payments crisis later exposed fiscal and governance weaknesses, leading to external debt-service suspension and an IMF-supported reform program from 2023.
Sri Lanka’s modern economy is service-led but remains closely tied to manufacturing, agriculture and overseas earnings. Official national accounts show real GDP growing by 5.0% in 2025; at current prices, services accounted for 54.6% of output, industry 25.4% and agriculture 8.4%, with the remainder recorded as taxes less subsidies. Commerce, transport and logistics, finance and telecommunications are important service activities, while manufacturing is led by apparel and textiles alongside food processing and rubber products. Tea remains a major plantation export, supplemented by coconut products, rubber, spices and gems; tourism, business and information services, and workers’ remittances provide substantial foreign exchange. The Sri Lankan rupee is the national currency. The United States and European markets are important destinations for manufactured exports, particularly garments, while India and China are major sources of imports. The 2022 crisis demonstrated the vulnerability created by high public debt, weak external buffers and dependence on imported fuel and intermediate goods. Although output and external balances subsequently improved, household welfare recovered more slowly, keeping fiscal stability, productivity, employment quality and export diversification central to development.
The final 2024 census counted 21,781,800 people at midnight on 18–19 December 2024, about 1.42 million more than in 2012 but representing average annual growth of only 0.5%. Aging is increasingly important: people aged 65 or above made up 12.6% of the population, compared with 7.9% in 2012. Settlement is markedly uneven. The Western Province alone contained 28.1% of residents, reflecting the concentration of employment, industry, transport and services around Colombo, Gampaha and the western urban corridor; denser settlement also follows the southwestern lowlands and parts of the central highlands, while much of the dry north-central and eastern interior is more sparsely populated. Colombo is the dominant commercial metropolis, Sri Jayawardenepura Kotte contains Parliament, and Kandy, Galle, Jaffna, Negombo and Trincomalee are major regional centers. Administration is organized through nine provinces and 25 districts, below which divisional secretariats and Grama Niladhari divisions provide local administrative frameworks. Settlement patterns still reflect plantation development, the civil war’s legacy and regional specialization.
Sinhala and Tamil are Sri Lanka’s official languages, while English has constitutional status as the link language and remains important in education, business and administration. The 2024 census, based on self-identification, recorded Sinhalese as 74.1% of the population, Sri Lankan Tamils 12.3%, Sri Lankan Moors 10.5% and Indian or Malaiyaha Tamils 2.7%; these are community categories, not equivalents of language or religion. Religious affiliation was also plural: 69.8% identified as Buddhist, 12.6% as Hindu and 10.7% as Muslim, with Roman Catholic and other Christian communities forming smaller shares. Geography and history shape these patterns. Sinhala-speaking Buddhist traditions predominate across much of the south, west and center; Tamil-speaking Hindu communities are concentrated especially in the north and parts of the east; Muslim communities have deep roots in coastal and trading towns; and Malaiyaha Tamil communities remain associated with central plantation districts. Cultural life includes Sinhala and Tamil literary traditions, Buddhist and Hindu sacred architecture, Kandyan artistic institutions, Muslim mercantile heritage and Portuguese-Dutch architectural layers in older coastal towns.
Transport and energy networks reflect both colonial inheritance and the modern concentration of activity in the Western Province. As of June 2026, the Road Development Authority managed about 12,310 kilometres of national A- and B-class roads and roughly 313 kilometres of expressways. Expressways connect the Colombo region with Bandaranaike International Airport and the southern coast, while trunk roads carry most domestic passenger and freight movement. Railways still follow many colonial-era alignments from Colombo toward Kandy and Badulla, the southern coast, Jaffna and eastern ports; they remain important but face speed, capacity and maintenance constraints. The Port of Colombo is the principal container and transshipment gateway, complemented by Hambantota on the southern coast and Trincomalee’s extensive natural harbor in the east. Electricity combines major hydroelectric schemes with thermal generation and expanding solar and wind capacity; the current long-term generation plan targets 70% renewable electricity generation by 2030. Mobile and internet connectivity is extensive, but infrastructure quality and service reliability remain less even outside major urban and economic corridors.
Sri Lanka’s regional importance rests less on territorial scale than on its position beside India and near the principal east-west shipping routes of the Indian Ocean. That geography gives Colombo’s port system an economic role beyond the domestic market and makes maritime security and connectivity with the Indian subcontinent persistent strategic concerns. The country belongs to SAARC, BIMSTEC and the Indian Ocean Rim Association, linking it institutionally to both South Asian and wider Indian Ocean cooperation. Its opportunities include higher-value logistics and services, apparel upgrading, renewable power, export agriculture and tourism, but these depend on reducing debt vulnerability and raising productivity rather than merely restoring pre-crisis growth. An aging population, skilled emigration, uneven regional development, climate exposure, water-management pressures and unresolved questions of reconciliation and devolution remain structural constraints. Sri Lanka’s geography gives it enduring Indian Ocean relevance, but durable prosperity will depend on converting that advantage into fiscally sustainable, broadly shared economic gains.
