Indonesia is the bigger, more populous and richer of the two. It covers 1,904,569 km² against Nigeria’s 923,768 km², so it is about 2.1 times the size. It had roughly 288 million people in 2025, against Nigeria’s 243 million (2026 estimate). Its nominal GDP per capita is about US$5,360, against Nigeria’s US$1,560 (IMF, April 2026). Indonesia’s capital is Jakarta and its official language is Indonesian, a standardised form of Malay. Nigeria’s capital is Abuja and its official language is English, with Hausa, Yoruba and Igbo the largest of its roughly 500 languages. Both are tropical, Muslim-majority, oil-producing presidential republics that became independent after the Second World War, but they are built very differently.
A 5,120-Kilometre Archipelago Against One Block of the Gulf of Guinea
Indonesia stretches 5,120 km from west to east and 1,760 km from north to south, between the Indian and Pacific oceans. Depending on how you count, it has anywhere from 13,466 named islands to more than 17,500, of which about 922 are permanently inhabited. Five main islands carry most of the country: Sumatra, Java, Sulawesi, Kalimantan (Indonesia’s share of Borneo) and the western half of New Guinea. Indonesia has land borders with only three countries, all on shared islands: Malaysia and Papua New Guinea on Borneo and New Guinea, and Timor-Leste on Timor.
Nigeria is the opposite shape: one solid piece of West Africa between the Sahel and the Gulf of Guinea, between latitudes 4° and 14°N. Its land borders run for 4,047 km. It meets Cameroon for 1,690 km in the east, Niger for 1,497 km in the north, Benin for 773 km in the west and Chad for just 87 km in the far northeast. Indonesia ranks 14th in the world by area and Nigeria 31st.
Ring of Fire Volcanoes Against the Niger–Benue Y
Indonesia’s landscape comes from plate tectonics. The Eurasian, India-Australia and Pacific–Philippine Sea plates meet beneath the archipelago, and the subduction zones between them produce frequent earthquakes and about 400 volcanoes, roughly 130 of them active. The Toba super-eruption on Sumatra, about 74,000 years ago, left Lake Toba, now Indonesia’s largest lake. Tambora erupted in 1815 and was followed by the “Year Without a Summer” of 1816. The highest point, Puncak Jaya in the Sudirman Range of Central Papua, rises to 4,884 m. It is the highest island peak on Earth.
Nigeria has nothing like Indonesia’s volcanic arc. Its shape comes from two rivers. The Niger flows in from the northwest and the Benue from the east, and they meet in a Y before running south into the Niger Delta. It is one of the world’s largest river deltas and holds a large area of Central African mangroves. Southeast of the Benue the land climbs to the Mambilla Plateau, which continues into Cameroon’s Bamenda Highlands. Chappal Waddi, on the Cameroon border, is the highest point at 2,419 m, about half the height of Puncak Jaya.
The two countries also differ in climate. Indonesia lies across the equator, between 11°S and 6°N, and has extensive tropical forests, with the largest remaining forest areas in Papua and Maluku. Nigeria gets drier from south to north. The coastal rainforest belt receives 1,500–2,000 mm of rain a year. The middle of the country is Guinean forest-savanna mosaic, and the north is Sudan and Sahel savanna, where rainfall drops to between 500 and 1,500 mm.
Crowded Java Against Africa’s Fastest-Growing Giant
Indonesia ranks fourth in the world by population. Its 2020 census counted 270,203,917 people, and civil-registration data put the total at 288,315,089 in 2025. More than half of them live on Java, which covers under 7% of the land but is the most populous island in the world. Greater Jakarta (Jabodetabek) has more than 40 million people and is counted as the most populous urban area anywhere.
Nigeria ranks sixth, with an estimated 242.7 million people in 2026, the most of any African country. Its population has grown fast. UN estimates put it at 38 million in 1950 and 191 million in 2016, and the UN projects about 375 million by 2050. That would probably make Nigeria the third most populous country in the world and push it well past Indonesia. Lagos, the largest city, had an estimated 17 to 21 million residents in November 2025 and is the most populous urban area in Africa.
Nigeria has fewer people, but because it is half the size it is more crowded. Dividing the figures above gives about 263 people per km², against Indonesia’s roughly 151.
Bahasa Indonesia Against English, Hausa, Yoruba and Igbo
Both are hugely multilingual, yet they chose opposite national-language policies. Indonesia has more than 700 languages and hundreds of ethnic groups. It made Indonesian, a standardised variety of Malay, its single official and national language. The national motto, Bhinneka Tunggal Ika, means “unity in diversity”.
Nigeria has more than 250 ethnic groups. Of the 525 languages known to have been spoken there, eight are now extinct. The Hausa, Yoruba and Igbo together make up over 60% of the population, so no single African language could be made national without favouring one region. English, left over from British rule, became the official language. Nigerian Pidgin is widely used as an everyday common language, especially in the Niger Delta. Our guide to the languages spoken in Nigeria maps where each one is used.
Religion follows a similar pattern. In 2025, 87.15% of Indonesians were Muslim, about 251 million people, the largest Muslim population of any country. Christians made up 10.44% and formed majorities in several eastern provinces, while Hindus (1.66%) are concentrated in Bali. Nigeria is split roughly in half. Pew Research Center put it at 56.1% Muslim and 43% Christian in 2020, with a mainly Muslim north and a mainly Christian south and southeast. Both countries belong to the Organisation of Islamic Cooperation.
Coal, LNG and Java’s Factories Against Niger Delta Crude
Indonesia’s economy is about four times the size of Nigeria’s. The IMF’s April 2026 database puts Indonesian nominal GDP at US$1.540 trillion, 17th in the world, and Nigeria’s at US$377 billion, 46th.
Oil has played very different roles in the two countries. Shell-BP struck oil at Oloibiri in 1956, and Nigeria joined OPEC in 1971. Oil revenues supply about two-thirds of state revenue, although by February 2021 the oil sector produced only about 9% of GDP. No city in West or Central Africa outranks Lagos as a financial centre.
Indonesia was an OPEC member from 1962 to 2008. It left after becoming a net importer of oil, rejoined in January 2016 and suspended its membership again at the end of that year. Its energy now rests on coal, which dominates both its energy production and its electricity generation. It also exports large amounts of coal and liquefied natural gas, and in 2023 it ranked first in the world for geothermal power generation. Factories and services on Java produce most of its output. The economy of Indonesia has its own guide. The UN’s 2023 Human Development Index gives Indonesia 0.728 (113th) and Nigeria 0.560 (164th).
Jakarta to Nusantara, Lagos to Abuja
Both countries decided their largest city should not stay their capital, but only one has finished the move. Nigeria moved its capital from coastal Lagos to Abuja, a city built from scratch at the centre of the country, on 12 December 1991. Abuja lies in its own Federal Capital Territory beneath Aso Rock, a 400 m monolith left by water erosion. The UN reported that it grew by 139.7% between 2000 and 2010. Our guide to Abuja, Nigeria’s capital, covers how the city was planned.
Indonesia is partway through the same move. Jakarta, the old Dutch colonial capital Batavia, is overcrowded and sinking. In 2022 work began on Nusantara, a new capital in East Kalimantan on Borneo, next to the port of Balikpapan. The project is estimated at US$35 billion and is planned in five phases running to 2045, the centenary of independence. Indonesia held its Independence Day ceremony there for the first time on 17 August 2024. For now, however, Jakarta remains the official capital.
Indonesia is a unitary presidential republic under its 1945 Constitution, which was amended four times between 1999 and 2002. It has 38 provinces, and the president serves at most two five-year terms. The current president is Prabowo Subianto, with Gibran Rakabuming Raka as vice president. Nigeria is a federal republic of 36 states plus the Federal Capital Territory, modelled on the United States. Its president serves at most two four-year terms, and its National Assembly has a 109-seat Senate and a 360-seat House of Representatives. The current president is Bola Tinubu, with Kashim Shettima as vice president.
Their histories since independence have followed a similar path. Indonesia declared independence in 1945, and the Netherlands transferred sovereignty at the end of 1949. Nigeria became independent from Britain on 1 October 1960, 46 years after the Northern and Southern protectorates were merged in 1914. Both were soon taken over by the army. Nigeria had its first coup on 15 January 1966 and then fought the Biafran civil war from 1967 to 1970. In Indonesia, Suharto became acting president in March 1967, after the army put down the 30 September Movement of 1965, which it presented as a communist coup, and an anti-communist campaign in which at least 500,000 people were killed. Both returned to democracy at almost the same moment: Suharto fell in 1998, and Nigeria’s Fourth Republic constitution took effect on 29 May 1999.
Batik and Borobudur Against Nollywood and Nok
Even the two names have a parallel. “Indonesia” combines India with the Greek nesos, “island”. The ethnologist James Richardson Logan adopted it as a geographical term in 1850. “Nigeria” comes from the Niger River and was coined by the British journalist Flora Shaw on 8 January 1897.
Their oldest heritage sites are very different. On Java, Hindu and Buddhist rulers built Borobudur and Prambanan between the 8th and 10th centuries. In Nigeria, the Nok culture, which may have emerged as early as 1500 BC, made terracotta figures regarded as the earliest large figurative sculpture in Africa outside ancient Egypt. In modern culture, Indonesia’s best-known export is batik, the wax-resist dyed cloth. UNESCO listed it as intangible heritage on 2 October 2009, and Indonesians now mark that date each year as National Batik Day. Nigeria’s best-known export is Nollywood, its fast-moving film industry, which grew from cheap home-video releases in the 1990s.
So Indonesia wins on area, population, economic size and income per head, and Nigeria is more densely settled and is projected to grow much faster. To see how Indonesia’s landmass is broken up across the sea, read our complete guide to the Indonesian islands.