Indonesia is famous for its beautiful islands, rich cultural heritage, and extraordinary natural landscapes. While Bali, Lombok, and Raja Ampat attract travelers from around the world, there are still many fascinating destinations waiting to be explored. One of them is Kalimantan, the Indonesian part of the vast island of Borneo.
Located in Southeast Asia, Borneo is known for its ancient tropical rainforests, rare wildlife, winding rivers, and diverse Indigenous cultures. The island is shared by Indonesia, Malaysia, and Brunei Darussalam, making it one of the most geographically and culturally interesting places in the region.
For travelers who enjoy nature, adventure, and authentic cultural experiences, Borneo offers much more than its reputation as a remote rainforest destination. From spotting orangutans in their natural habitat to learning about Dayak traditions and exploring unique freshwater ecosystems, there are countless reasons to discover this remarkable island.
Before planning your journey, let’s explore these 10 interesting facts about Borneo and learn what makes the island so special.
1. Borneo Is the Third-Largest Island in the World
Borneo is the third-largest island in the world, after Greenland and New Guinea. Covering approximately 743,330 square kilometers, it is larger than many countries and contains an extraordinary variety of landscapes.
The island lies near the equator in Southeast Asia, with the South China Sea to the northwest and the Java Sea to the south. Sumatra lies to the west, Java to the south, and Sulawesi to the east.
Despite its enormous size, Borneo remains less visited by international tourists than some of Indonesia’s more famous destinations. This makes it an appealing choice for travelers looking for a quieter, more nature-focused holiday.
The island’s landscape includes dense tropical rainforests, mountain ranges, mangrove forests, peat swamps, coastal areas, and extensive river systems. These different environments support a remarkable variety of plants and animals.
For nature lovers, Borneo is an ideal destination for rainforest exploration, wildlife watching, river journeys, and cultural encounters with local communities.
2. Borneo Is Shared by Three Countries
One of the most interesting facts about Borneo is that its territory is divided among three countries: Indonesia, Malaysia, and Brunei Darussalam.
The Indonesian portion is known as Kalimantan and occupies most of the island. The Malaysian territory consists of two states, Sabah and Sarawak, while Brunei is a small independent nation located on the northern coast.
Although these territories share the same island, each has its own identity, history, culture, and attractions.
In Indonesian Kalimantan, visitors can explore traditional river settlements, rainforest conservation areas, and destinations such as Tanjung Puting National Park. Sabah is known for Mount Kinabalu and wildlife experiences, while Sarawak offers national parks, caves, and cultural attractions. Brunei provides another perspective on Borneo through its Islamic architecture, royal heritage, and traditional water villages.
This geographical division makes Borneo especially fascinating for travelers interested in exploring different cultures within a single island.
It is also worth remembering that Borneo and Kalimantan are not exactly the same. Borneo refers to the entire island, whereas Kalimantan refers to the Indonesian region.
3. Borneo Is Home to One of the World’s Oldest Tropical Rainforests
Borneo’s tropical rainforest is among the oldest rainforest environments on Earth, with some estimates suggesting that parts of its forest history extend back around 100 million years or more.
Its warm, humid climate and abundant rainfall have helped create a complex ecosystem that supports thousands of plant and animal species. Towering trees form a dense canopy, while vines, ferns, orchids, and other tropical plants thrive beneath them.
One of the most important conservation areas is the Heart of Borneo, a vast forest landscape spanning Indonesia, Malaysia, and Brunei. This region contains extensive tropical forests that provide habitat for endangered wildlife and support the livelihoods of Indigenous communities.
Borneo’s rainforests are also important for regulating water systems, storing carbon, and maintaining ecological balance. Numerous rivers begin in the island’s forested highlands before flowing toward the coast.
However, these natural environments face growing challenges from deforestation, land conversion, and habitat fragmentation. Protecting the remaining rainforest is essential for preserving Borneo’s biodiversity.
For travelers, visiting responsibly managed conservation areas offers an opportunity to appreciate the beauty of the rainforest while learning about the importance of sustainable tourism.
4. Borneo Has a Different Earthquake and Volcano Profile from Many Other Indonesian Islands
Indonesia is located in a geologically active region, and many of its islands experience earthquakes and volcanic activity. Borneo has a different geological profile from islands such as Java and Sumatra, where active volcanoes and major tectonic activity are more prominent.
The Indonesian portion of Borneo does not have the extensive active volcanic mountain chains found on Java or Sumatra. As a result, travelers will encounter a landscape shaped more by forests, rivers, hills, and ancient geological formations than by active volcanoes.
However, it would be inaccurate to describe Borneo as completely safe from earthquakes. Earthquakes can still occur, and seismic activity in surrounding regions may affect parts of the island.
Borneo’s natural attractions include Mount Kinabalu in Sabah, limestone formations, extensive river systems, and forest-covered highlands. These landscapes offer excellent opportunities for hiking, photography, and nature exploration.
For visitors, the main takeaway is that Borneo has a distinct geological character, but ordinary travel precautions and attention to local safety advice remain important.
5. Borneo’s Rainforests Are a Global Biodiversity Treasure
Borneo is one of the world’s important biodiversity hotspots. Its forests contain a remarkable variety of plant and animal life, including species found nowhere else on Earth.
The island’s tropical ecosystems include lowland rainforests, montane forests, mangroves, freshwater wetlands, and peat swamp forests. Each habitat supports different forms of life and plays a role in maintaining the island’s ecological balance.
According to conservation information published by WWF, Borneo is home to approximately 15,000 plant species or more, including thousands of species that are endemic to the island. Its forests also support hundreds of bird and mammal species.
One of the most remarkable features of Borneo’s natural environment is its interconnectedness. Rivers carry water and nutrients through forest landscapes, while trees provide food and shelter for wildlife. Many local communities also depend on these ecosystems for food, materials, and their livelihoods.
Despite its ecological importance, Borneo’s rainforest continues to face pressure from deforestation, plantation expansion, and other land-use changes.
Conservation initiatives across the island aim to protect important habitats and encourage more sustainable land management. Responsible ecotourism can contribute by supporting local guides, conservation projects, and community-based tourism.
6. Borneo Is Home to Rare and Endangered Wildlife
For wildlife enthusiasts, Borneo is one of Southeast Asia’s most exciting destinations. Its tropical forests provide a home for several rare animals, including the Bornean orangutan, proboscis monkey, Bornean elephant, and sun bear.
The Bornean orangutan is perhaps the island’s most famous animal. These intelligent great apes spend much of their lives in trees, where they search for fruit, leaves, and other foods. Habitat loss and other human-related pressures have made orangutan conservation a major priority.
Another distinctive species is the proboscis monkey, known for its prominent nose, reddish-brown fur, and long tail. It is native to Borneo and is often found in mangrove forests, riverine forests, and other wetland habitats.
The Bornean elephant, a smaller subspecies of Asian elephant, inhabits parts of northeastern Borneo, particularly in Sabah. The island is also home to sun bears, clouded leopards, hornbills, and numerous reptiles and amphibians.
Travelers hoping to see wildlife can visit conservation areas and national parks, including Tanjung Puting National Park in Central Kalimantan and Sebangau National Park.
Wildlife sightings are never guaranteed, so patience and guidance from experienced local guides are important. Visitors should also maintain a respectful distance from animals and avoid feeding or touching them.
7. Borneo Has a Rich Indigenous Heritage, Including the Dayak Peoples
Borneo is not only rich in biodiversity; it also has a remarkable cultural heritage shaped by generations of Indigenous communities.
The term Dayak is commonly used as a collective name for many Indigenous peoples of Borneo, particularly in Indonesian Kalimantan. Dayak communities are culturally diverse, with different languages, customs, traditional laws, art forms, and social practices.
Many Dayak communities have historical connections to the island’s forests and rivers. Traditionally, these environments have provided food, building materials, medicinal plants, and transportation routes.
One of the best-known features of traditional Dayak architecture is the longhouse. Depending on the community, longhouses can accommodate multiple families and serve as important social spaces for community life and cultural activities.
Dayak cultural traditions also include weaving, wood carving, beadwork, music, dance, and ceremonial practices. Their specific forms vary considerably between communities, so it is important not to treat Dayak culture as a single uniform tradition.
Today, many Indigenous people in Borneo live in towns and cities as well as rural villages, combining contemporary lifestyles with cultural traditions they continue to value and maintain.
For visitors, cultural tourism can provide meaningful opportunities to learn about local heritage. The most respectful approach is to visit with knowledgeable local guides, ask permission before taking photographs, and follow community guidelines.
If you are interested in learning more, explore our related guide to the Dayak Tribe: Culture, Traditions, History and Life in Borneo.
8. Kakaban Lake Is Famous for Its Stingless Jellyfish
Among Borneo’s most unusual natural attractions is Kakaban Lake, located on Kakaban Island in the Derawan Islands area of East Kalimantan, Indonesia.
Unlike an ordinary coastal lagoon, Kakaban Lake is an isolated marine lake surrounded by steep limestone terrain. Over time, geological changes separated the lake from the open sea, creating a distinctive environment for marine life.
The lake is particularly famous for its jellyfish, including species that have become known for their reduced or relatively mild stinging ability. Visitors may encounter several types, including moon jellyfish and upside-down jellyfish.
The unusual ecosystem has made Kakaban a fascinating destination for researchers and nature travelers. Its jellyfish and other aquatic organisms demonstrate how wildlife can adapt to isolated environments over long periods.
However, it is important not to assume that every jellyfish is completely harmless. Visitors should follow local guidance, avoid touching wildlife unnecessarily, and check current swimming regulations before entering the water.
Kakaban is also part of the wider Derawan Islands region, which is known for its marine biodiversity, coral reefs, and opportunities for snorkeling and diving.
For travelers exploring East Kalimantan, Kakaban Lake offers a memorable experience that combines island scenery with a rare natural phenomenon.
9. Sebangau National Park Protects Important Peat Swamp Forests
Sebangau National Park, located in Central Kalimantan, is one of Indonesia’s important protected rainforest areas. The park is especially known for its extensive peat swamp forests, which provide essential habitat for wildlife and store significant amounts of carbon.
Peat swamp forests develop in waterlogged environments where partially decomposed plant material accumulates over long periods. These ecosystems play an important role in regulating water, supporting biodiversity, and helping reduce the release of stored carbon when they remain intact.
Sebangau is also known for its orangutan population. Protecting the park’s forest habitat is important for the long-term survival of these endangered great apes and many other species.
Exploring Sebangau can be very different from visiting a conventional tourist attraction. Access depends on the location, weather, water levels, and arrangements with park authorities or local operators. Some excursions may involve river transportation, boats, or travel through remote areas.
Visitors should plan ahead, arrange suitable local guidance, and confirm current access conditions before departure. It is also important to respect park rules and avoid activities that disturb wildlife or damage sensitive peatland habitats.
For travelers interested in Borneo ecotourism, Sebangau offers a chance to understand why rainforest and wetland conservation matter, while experiencing a landscape that remains relatively unfamiliar to many international visitors.
10. Water Buffalo Can Be Raised in the Swamps of South Kalimantan
Borneo is often associated with tropical rainforests and rare wildlife, but the island’s human landscapes are equally fascinating. In parts of South Kalimantan, traditional livelihoods have developed around rivers, wetlands, and seasonal flooding.
One interesting example is the swamp buffalo associated with the Danau Panggang area near Amuntai. In this wetland landscape, local farmers raise buffalo that are adapted to life around flooded grasslands and marshes.
Unlike cattle raised mainly on dry pasture, these buffalo can be managed in environments where water levels change throughout the year. The animals are an important part of local agricultural traditions and demonstrate how communities adapt their livelihoods to the surrounding landscape.
Depending on local conditions and farming practices, herders may use boats to reach their animals or move around the wetlands. The sight of buffalo grazing in shallow water is a distinctive feature of this part of Kalimantan.
The region also reflects Borneo’s long relationship with rivers and waterways. In many parts of the island, rivers remain essential transportation routes and influence settlement patterns, food production, and everyday life.
Travelers interested in authentic cultural experiences may find the wetlands around Danau Panggang worth exploring. However, visits should be arranged with local residents or reputable guides, and access to private farming areas should always be respectful and permitted.
This lesser-known attraction highlights another side of Borneo: an island where wildlife, agriculture, traditional knowledge, and water-based lifestyles are closely connected.
Why Borneo Is Worth Exploring
These facts about Borneo reveal an island that offers far more than dense forests and remote wilderness. It is a destination where exceptional biodiversity, Indigenous cultures, river-based communities, and fascinating natural landscapes come together.
From the world’s third-largest island and its three-country division to the orangutans of Kalimantan, the cultural heritage of Dayak communities, and the unusual jellyfish of Kakaban Lake, Borneo offers a wealth of discoveries for curious travelers.
The island also faces important conservation challenges. Protecting its rainforests, endangered wildlife, and traditional landscapes will require cooperation between governments, local communities, conservation organizations, and responsible visitors.
For travelers seeking a deeper connection with Indonesia, Kalimantan is well worth considering. With thoughtful planning and respect for local communities and the environment, a journey to Borneo can become an enriching experience filled with nature, culture, and discovery.
Frequently Asked Questions About Borneo
1. Where is Borneo located?
Borneo is a large island in Southeast Asia, situated near the equator. It is surrounded by several seas and lies between mainland Southeast Asia and other major Indonesian islands.
2. Is Borneo part of Indonesia?
Partly. The Indonesian portion of Borneo is called Kalimantan. The rest of the island consists of the Malaysian states of Sabah and Sarawak and the independent country of Brunei Darussalam.
3. What is Borneo famous for?
Borneo is famous for its tropical rainforests, orangutans, proboscis monkeys, Indigenous cultures, extensive rivers, and extraordinary biodiversity. It is also known for destinations such as Tanjung Puting National Park, Mount Kinabalu, and Kakaban Lake.
4. What animals can you see in Borneo?
Depending on the location, visitors may see Bornean orangutans, proboscis monkeys, Bornean elephants, sun bears, hornbills, and many other tropical species. Wildlife sightings depend on habitat conditions, season, and luck.
5. What is the best time to visit Borneo?
Borneo has a tropical climate throughout the year, with warm temperatures and rainfall that varies by location and season. The best time to visit depends on your itinerary and activities. Check local weather forecasts and river or trail conditions before traveling, especially when visiting remote national parks.
6. Is Borneo suitable for nature and cultural tourism?
Yes. Borneo offers wildlife watching, rainforest walks, river cruises, snorkeling, diving, and cultural experiences. Travelers can also learn about Indigenous heritage and traditional livelihoods by visiting communities through respectful, locally guided experiences.