Sangkulirang-Mangkalihat Karst: Limestone Hills and Rock Art
Sangkulirang-Mangkalihat karst at a glance: limestone hills and rock art in East Kalimantan
The Sangkulirang-Mangkalihat karst is a large landscape of limestone hills, caves and rock-art sites in East Kalimantan, on the eastern side of Borneo. It stretches across the regencies of East Kutai and Berau and includes the Mangkalihat Peninsula, which runs out into the sea. The karst is one of the larger limestone landscapes on the island, and it is valued for its caves, its forests and the red paintings that survive on its rock walls. It is a remote destination, best suited to visitors who plan with care and who value wild places over comfort.
Where the karst lies and how big it is
The karst lies across two regencies, East Kutai, known in Indonesian as Kutai Timur, and Berau. The Mangkalihat Peninsula extends from this landscape into the sea, which gives the karst a coastal edge as well as an interior of hills and forest. The landscape is largely forested and sparsely settled, and its remoteness has helped keep much of it in a natural state.
The exact boundaries of the karst and its total area depend on the latest mapping work. The more useful way to understand the karst is by its landscape: steep hills, deep caves and a coastline that breaks up into limestone headlands.
The limestone landscape and how it was formed
Karst is a landscape formed by the slow dissolving of limestone by rainwater. The process produces caves, sinkholes, towers and underground rivers, and the Sangkulirang area shows the full range of these forms. The hills here are steep limestone towers and ridges, covered in forest, and they rise abruptly from the lowland in a way that catches the eye from a distance.
Limestone of this kind formed over long periods under the sea before it rose above the water. The rock still carries the marks of that history, with bands of fossil-rich stone and sharp, uneven surfaces that cut into boots and skin. Walking on the limestone needs care, and the edges of the rock can be sharp enough to cut through a glove or a thin sole.
Caves and cave systems run through the hills. Some are known to local communities, and others have been surveyed, but many remain difficult to reach. Cave access needs a guide, proper lights and a good understanding of how water moves through the rock.
The red rock art on the cave walls
The karst is notable for its red rock-art sites, painted in red pigment on cave walls and in rock shelters. The paintings show hand stencils, figures of animals and human-like shapes, and the motifs are simple and direct. The hand stencils are among the most striking, since each one records a real hand pressed against the rock and outlined in pigment.
Some of the painted hands are tens of thousands of years old. The exact age is still debated, so a visitor who wants a precise figure should not trust a single number. Even without a precise date, the paintings are clearly among the oldest painted art in the region, and standing in front of a stencil makes the length of time easy to feel.
Access to the painted sites is limited. Visitors should respect the sites and the local rules for entering them, and they should never touch the paintings or the rock beneath them. Oils from skin and loose dust can damage pigment that has survived for thousands of years.
Caves, water and the forest above the limestone
The caves hold formations of stalactites and stalagmites, and the water systems inside them are important to the local ecology. Water that falls on the hills sinks into the limestone, moves through the caves and returns to the surface in springs and streams. That slow movement shapes the forest above and the streams below.
The forest above the karst is a mix of lowland and hill forest, and its trees are adapted to thin soils on the limestone. The forest supports wildlife, including primates and birds, and the species list for the karst is one that a visitor should check with a local guide before naming any particular animal. The surrounding rivers and streams carry water from the karst into the lowland areas used by local communities, so the health of the hills affects the people who live below them.
What is pressing on the karst today
Forest loss from logging, clearing and conversion of land is the main pressure on the karst. Each cleared slope changes how water moves through the hills, and the loss of trees exposes the limestone to faster erosion. The effects reach the caves and the rivers below.
Plantations and mining in the wider region create pressure on the forest edges and on the water systems. Limestone quarrying is a threat to karst landscapes in many parts of Indonesia, and it can damage caves and reshape hills within a few years. Protecting the caves and the rock art depends on controlled access, clear local management and the willingness of visitors to leave the places as they found them.
Getting to the karst and its remote sites
The karst is reached from the towns of East Kalimantan by road and river, depending on the destination within the area. The Mangkalihat Peninsula is reached by longer routes, which can involve rough roads or boat travel. Journeys are long and often slow, and local guides are needed for the remote sites, since the tracks are hard to follow without local knowledge.
Check the current access, the permits and the guide arrangements before you plan a visit. Rules change, and some sites may be closed or require specific arrangements. A visit to the karst works best when it is planned with a local operator who knows the current conditions, the state of the roads and the rules that apply to the rock-art sites.
Season, weather and what the rain does to the rock
The drier months are easier for travel on rough roads and for walking the limestone trails. The wetter months bring heavy rain, which can flood rivers and make the limestone surfaces very slippery. A wet limestone path is one of the most dangerous surfaces in the region, and a fall on sharp rock can cause serious injury.
Caves can be wet and dark, and a good torch is essential. Carry spare batteries and keep your lights in a dry bag, since water can reach the cave floor after a storm even when the sky is clear above.
Who the karst suits and who should skip it
A visitor who is prepared to walk on difficult ground, to wait for the right weather and to follow a guide’s instructions will find the landscape deeply rewarding. It is a place for people who value remoteness and who understand why it needs protection.
Casual visitors who hope for easy access or developed facilities will be disappointed by the karst. The roads are rough, the trails are demanding and the facilities are basic or absent. A traveller who needs comfort and short distances will find the karst too demanding.
Pairing the karst with the rest of East Kalimantan
The East Kalimantan hub covers the wider region, and it is the place to start when planning a trip that includes the karst. Balikpapan is the gateway city for most travel into the region, with its airport and its port, and the city’s bay and hills make a useful first stop. The Mahakam River gives a different view of the province, with boats, villages and forest edges along its banks. The Derawan Islands lie off the same coast, and their reefs and turtle beaches provide a contrast to the inland limestone.
The wider road and boat network is covered in the getting-around guide for Kalimantan, which helps plan the long journeys between the coast and the interior. A traveller who builds a route through several of these places will see the range of the province, from the sea to the hills and the rivers.
Useful Indonesian words for the karst
Karst is the same word in Indonesian. Gua is cave and batu kapur is limestone. Lukisan gua is cave painting, and tangan is hand. Hutan means forest and sungai is river. Semenanjung means peninsula, pemandu is guide and izin is permit. These words help you read the signs and talk with the guides who know the karst.
Practical notes before a trip into the karst
Carry water, food, a torch and a first-aid kit for any remote trip. Pack a spare set of clothes for crossing rivers, and wear footwear with good grip for the limestone. Do not touch the rock art or remove any material from the caves, and leave every site as you found it.
The karst is a landscape that asks for patience and respect. A visitor who prepares well, moves carefully and listens to the local guides will come away with a clear sense of a place that is still largely untouched, and of the work needed to keep it that way.
Related guides: sangkulirang karst, How Sangatta fits into East Kutai, East Kutai Landscapes: Karst, Rainforest and Coast Compared.