100 Questions on Indonesian Geography

A set of questions that begin relatively easy and become progressively harder.
Cities' populations are for the city proper and not the associated metropolitan areas
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Cominou
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Last updated: April 4, 2026
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First submittedApril 3, 2026
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Capital and largest city
Jakarta
World's most populous island
Java
National currency
Indonesian Rupiah
Tourism makes up 80% of the economy of this Hindu-majority island
Bali
Biggest city of that island
Denpasar
National park home to the world’s largest lizard species
Komodo National Park
Country's second most populous city, nicknamed 'City of Heroes'
Surabaya
Largest Buddhist temple in the world
Borobudur
Second largest Hindu temple in Southeast Asia located close to the previous answer
Prambanan
Country's third largest city where a famous conference between non-aligned countries was held in 1955, at the height of the Cold War
Bandung
Airline and flag carrier of the country
Garuda Indonesia
Indonesian name of Borneo
Kalimantan
Sulawesi's largest city that gave its name to the strait separating the island from Borneo
Makassar
Named after one of the four cardinal directions in Malay, Indonesia shares this island with another country
Timor
Built at the confluence of the Deli and Babura River, this city has been listed by the National Development Planning Agency as one of the four main central cities in Indonesia
Medan
Only province where Sharia law is implemented and enforced
Aceh
That province's most populous city
Banda Aceh
Planned city set to be inaugurated as Indonesia's new capital in 2028
Nusantara
Language mostly spoken in western Java. With 35 million speakers, it is the second most widely spoken regional language
Sundanese
World's largest volcanic lake and country's largest lake, by both area and volume
Lake Toba
Coastal city sometimes referred to as the 'Venice of Java' for its extensive network of canals running through it and renowned for its preserved colonial-era city center as well as its prestigious universities
Semarang
Top palm oil producing province. It also has the largest planted area of oil palms, with 2.87 million hectares
Riau
One of the country's most populous cities, with a Christian-majority population and served by the Sam Ratulangi International Airport
Manado
Island of the Lesser Sunda Islands where a distinct human species used to live until 50,000 years ago, known for their small size (just over 1 meter) and nicknamed 'Hobbits' by their discoverers
Flores Island
Volcano on the island of Sumbawa whose 1815 explosion is considered the largest and most-destructive volcanic event in recorded history, causing the world's average temperature to drop by as much as 3°C. This led to the year 1816 being called the “year without a summer" as crop failures in Europe and North America led to mass starvation
Mount Tambora
Located at the epicenter of the Coral Triangle, this archipelago of over 1,500 islands in Southwest Papua was designated as an UNESCO biosphere reserve and offers some of the country's best sights
Raja Ampat
Last remaining Sultanate of Indonesia, its sultan is officially recognized by the national government
Yogyakarta Sultanate
Based in a neighbouring city and taking the name of Sunanate, this monarchy still endures to this day albeit stripped of its former political power, unlike the previous answer
Surakarta Sunanate
Most populous city of the Riau Islands
Batam
Second-highest volcano in the country, located on the island of Lombok
Mount Rinjani
Most numerous of the three major linguistic and ethnic groups of South Sulawesi, along with Makassarese and Torajan
Bugis
String of three small but touristic islands off Lombok's west coast, with a redundant name
Gili Islands (gili means 'island' in sasak, Lombok's main language)
One of the 4 seas bordering the Maluku islands, which takes its name from a group of ten volcanic islands that were, until the mid-19th century, the world's only source of mace and nutmeg
Banda Sea
Largest city of Indonesian Papua, located only 35 km west of Papua New Guinea
Jayapura
Located off Jakarta's coast, this touristic archipelago made up of 342 islands is the smallest regency by area in the country. Do not trust its name!
Thousand Islands
Archipelago comprising 2 main islands and many smaller islets lying between Borneo and Sumatra, accounting for 90% of Indonesia's tin production
Bangka Belitung Islands
Largest city of that archipelago and regency
Pangkalpinang
North Maluku's largest island
Halmahera
Standing at 3,805 metres above sea level, this volcano is the highest volcano in Indonesia and is Sumatra's highest peak
Mount Kerinci
Major city of around 250,000 inhabitants. 45% of the population is estimated to be of Chinese descent. Hakka Chinese is commonly spoken in the city, even among other ethnicities
Singkawang
Capital and largest city of the province of Maluku, located on an island of the same name.
Ambon
Large square in the center of Jakarta measuring around 100 hectares, it is the world's 3rd largest square. The National Monument stands in the middle of it
Merdeka Square
Located on a small island sharing the same name, this city is North Maluku's most populous. From the 15th to the 20th century, it acted as the capital of a Sultanate which, at its greatest extent, stretched from Sumbawa to the south of Mindanao
Ternate
Name for predominantly rural Level 2 administrative subdivisions (Indonesian name required)
Kabupaten
Name for predominantly urban Level 2 administrative subdivisions (Indonesian name required)
Kota
Name for Level 3 administrative subdivisions (Indonesian name required)
Kecamatan
Also named Equatorial City due to being located precisely on the equator, this city is one of Borneo's largest
Pontianak
Largest river of the country, the city mentioned above sits on its delta
Kapuas River
Another river of the same name originates in this mountain range at the center of Borneo
Müller Mountains
Largest, by land area, island of the Riau Islands
Bintan Island
Tolled expressway spanning the entire island of Java, from the Port of Merak on its west coast to Banyuwangi on its east coast
Trans-Java Toll Road
Island southeast off Sulawesi where the oldest cave paintings in the world were found in 2026, dating back at least 67,800 years
Muna Island
Indonesia's most Christian province, by percentage of the population
Highland Papua
Island off Sumatra's west coast famous for its unique culture, sometimes referred to as one of the world's few remaining Megalithic cultures, and its popular surfing spots
Nias Island
Peninsula divided into North Sulawesi, Gorontalo and parts of Central Sulawesi that takes its name from the main ethnic group native to this region.
Minahasa Peninsula
Fictional line separating the Indomalayan biogeographic realm from the Australasian biogeographic realm, splitting Indonesia into two ecozones
Wallace Line
South Papua's largest island, separated from the mainland by a narrow strait
Yos Sudarso Island
Sea lying southwest of that island, spanning over 1,000,000 km² and bordered by Australia's northern coast to the south
Arafura Sea
Longest river in East Kalimantan, with a fan-shaped delta
Mahakam River
East Kalimantan's capital city, located on the riverbanks of that river
Samarinda
Country's highest mountain peak
Puncak Jaya
World's second-largest gold mine, located only 4 km west of it
Grasberg mine
Mountain range extending over 692 km in the provinces of Central Papua and Highland Papua where you can find that mine
Maoke Mountains
Much less known, this peak is the second highest freestanding mountain in the country
Puncak Mandala
Archipelago off Sumatra's west coast located in one of the most seismically active zones in the world and home to more than 20 endemic species
Mentawai Islands
Indonesia's first national park and UNESCO World Heritage Site in Banten containing the largest population of the Critically Endangered Javan rhino
Ujung Kulon National Park
Derived from Jakarta's colonial name, Batavia, this term designates one of the most recently-formed ethnic groups of the country, native to this city and its surroundings. Their language, a Malay-based creole language of the same name, has become today one of the main sources of inspiration for Indonesian slang
Betawi people
Mountain range spanning the whole length of Sumatra, almost 1,700 km, covering the western side of the island from south to north
Barisan Mountains
High volcanic plain in Central Java forming the floor of a large caldera complex of the same name, known for its cool climate and 8th-9th century Hindu temples
Dieng Plateau
West Sumatra's third largest and once nicknamed 'Paris of Sumatra', this city was home to the exiled emergency government during the country's war for independence
Bukittinggi
Small island of the Lesser Sunda, with Ba'a for capital it is the southernmost of the inhabited islands of Indonesia
Rote Island
Generic term designating the Austronesian ethnic groups of Borneo. Divided into more than 450 subcultures, this large group accounts for around 2 million people in Indonesian Borneo
Dayak people
Aceh city located on the shores of the Strait of Malacca. The Arun gas field, described as 'the most lucrative LNG operation in the 20th century' is located a few kilometers off the coast of this city
Lhokseumawe
Peninsula that makes up the northwest portion of the island of New Guinea. Sorong, West Papua's second largest city lies on its western edge
Bird's Head Peninsula
Smaller peninsula immediately south of it, with Fakfak as its largest settlement
Bomberai Peninsula
Bay that separates the two aforementioned peninsulas named after a town lying on its northern shore
Bintuni Bay
Largest lake of Sulawesi and Indonesia's second-largest, its mineral-rich surroundings support one of the most biodiverse tropical forests in the world
Lake Towuti
Medium-sized city in West Sumatra known as the site for the oldest coal mine in Southeast Asia which got classified as UNESCO World Heritage Site in 2019. After the closure of some mining sites, the city nearly became a ghost town
Sawahlunto
Named after Sumatra's second-highest peak, this ecosystem is considered to be one of the richest expanses of tropical rain forest in Southeast Asia and is the last place on earth where the Sumatran elephant, rhino, tiger and orangutan are found within one area
Leuser Ecosystem
Chain of small islands off the west coast of Indonesian Borneo that have given their name to the neighbouring strait linking the Java Sea to the South China Sea. The largest island of this archipelago has been classified as a nature reserve by the government
Karimata Islands
Northernmost and least populated city, located less than 200 km away from India's Nicobar Islands
Sabang
Large bay in northern Indonesian Papua, its name is Indonesian for 'Bird of Paradise'
Cenderawasih Bay
The largest island of that bay, theater of a major battle between American and Japanese forces during the Pacific War
Biak Island
Spanning 5.4 km, this bridge is the longest in the country and one of the longest in the Southern Hemisphere. It connects the islands of Java and Madura
Suramadu Bridge
Capital city of the province of North Maluku
Sofifi
Sea of over 100,000 km² surrounded by the islands of Sumba, Timor and Flores
Savu Sea
Largest settlement on Sumba island
Waingapu
Located between peninsular Malaysia and Sarawak, this regency made up of 272 islands constitutes the northernmost part of the Riau Islands
Natuna Regency
Largest island of that regency
Natuna Besar
Sumatra's second-longest river, its mouth was the site of an aviation disaster that killed 104 in 1997
Musi River
Karst area of 4,500 hectares in South Sulawesi, this UNESCO World Heritage Tentative Site is located 30 km north of Makassar and contains at least 238 prehistoric cave sites, among which 187 host cave drawings or rock images
Maros Pangkep Geopark
Gulf dividing the South and Southeast peninsulas of Sulawesi. It takes its name from a former Sultanate of South Sulawesi, now a regency's name of which Watampone is the capital
Gulf of Boni
Regency and archipelago of North Sulawesi comprising the island of Miangas which lies 87 km south of Mindanao and is Eastern Indonesia's northernmost point
Talaud Islands
One of the 5 districts of North Jakarta, it hosts a harbour of the same name which is Indonesia's busiest, handling more than 50% of Indonesia's trans-shipment cargo traffic
Tanjung Priok
Lake in South Sulawesi. With a depth of 590 m it is the deepest lake of the country, the 11th deepest lake in the world and the deepest lake on an island
Lake Matano
Marine national park off the coast of North Sulawesi that is said to host more than 70% of all the known fish species of the Indo-Western Pacific
Bunaken National Park
Largest mud volcano in the world, located in East Java, which has, since its first eruption in 2006, caused the displacement of more than 40,000 people, destroyed 15 villages and caused nearly $3 billion in damage
Lusi mud volcano
Spanning over 45,000 km², this regency in South Papua is the country's largest by land area
Merauke Regency
With around 25,000 inhabitants, this regency in Papua is the country's least populous
Supiori Regency
Largest settlement by population and home to the only airport of the Aru Islands, the easternmost archipelago of the Maluku Province
Dobo
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1 Comments
+2
Level 78
Apr 3, 2026
This was tough (I got 15 correct) but I was pleased to see a question about the Wallace Line, which I remember learning about at university. Fun fact: I named my first car Wallace in its honour.