ENIDDENL
Porites lutea coral (Porites lutea); see the caption for the photograph’s location.
Porites lutea colony off Guam, photographed by NOAA; a species and reef illustration, not a Kalimantan site photograph.NOAA (uncredited) · Wikimedia Commons · Public domain · Cropped · Original
Coral reefs · Kalimantan

Coral reefs

Living coral communities create marine structure across reef settings, including the distinct coastal and island seascapes documented in East and South Kalimantan.

Characteristics

Corals are animals, not marine plants. Reef-building colonies contain many small polyps whose hard skeletons contribute to the reef’s structure. Living tissue and the physical reef are therefore related but not identical: an attractive reef shape does not alone establish coral health or the identity of every colony.

Sources & references · 1NOAA Ocean Service · Are corals animals or plants?

Distribution

The Derawan landscape description identifies patch reefs, fringing reefs and atolls in East Kalimantan. Primary coral studies also document South Kalimantan island sites. This central habitat is shared across those relationships; no second province-specific reef record is needed, and one habitat link does not imply identical species lists.

Sources & references · 2UNESCO World Heritage Centre · Derawan Islands, Tentative List submissionIndonesian Journal of Marine Sciences Universitas Diponegoro · Hard coral community structure Marabatuan and Matasirih

Ecological importance

Living reef structure supplies shelter and feeding environments for marine animals. The connected records include reef-building Porites lutea and reef-associated fish, while the Derawan and Sipadan profiles explain different protected seascapes.

Sources & references · 3NOAA Ocean Service · Are corals animals or plants?Indonesian Journal of Marine Sciences Universitas Diponegoro · Hard coral community structure Marabatuan and MatasirihSabah Parks · Sipadan Island Park | Marine Life

Conservation

Many corals depend on symbiotic algae; environmental stress can cause bleaching, which is not the same as immediate death but increases risk. Keep hands, fins and anchors off living coral. Local management and current condition matter more than assuming that a legal designation means every reef is undamaged.

Sources & references · 2NOAA Ocean Service · Are corals animals or plants?Ministry of Marine Affairs and Fisheries · 87/KEPMEN-KP/2016: Derawan coastal and small-island conservation area

Species found here

Examples in the linked species profiles include Reef manta ray, Porites lutea coral, Humphead wrasse. Their profiles identify the particular locality and evidence. A habitat association does not mean the species occurs in every patch of that habitat.

Sources & references · 12World Register of Marine Species · Mobula taxon listFisheries 2025 10(2):66 · Staying Close to Home: Horizontal Movements of Satellite-Tracked Reef Manta RaysPLOS ONE 2022 · Reef manta ray population study in Komodo National ParkIntegrated Taxonomic Information System · Porites lutea taxonomic reportCorals of the World · Porites lutea species factsheetJournal of Coastal Development Universitas Diponegoro · Growth rates of massive coral Porites lutea in BontangIndonesian Journal of Marine Sciences Universitas Diponegoro · Hard coral community structure Marabatuan and MatasirihWorld Register of Marine Species / FishBase · Cheilinus undulatus Rüppell, 1835: taxon detailsFishBase · Cheilinus undulatus: field guide species summaryMarine Policy / study authors · Tackling illegal, unregulated, and unreported trade towards Humphead wrasse recovery in SabahUniversity of East Anglia / Tim Daw · Reef Fish Aggregations in Sabah, East MalaysiaIUCN assessment authors / ICAR-CMFRI repository · Cheilinus undulatus: Humphead Wrasse, IUCN assessment 2025

Protected areas

Documented landscapes to explore include Derawan coastal and island conservation area, Talang-Satang National Park, Sipadan Island Park. These areas contain habitat mosaics; the habitat does not cover their entire surface. Check each area’s access information before a visit.

Sources & references · 6NOAA Ocean Service · Are corals animals or plants?UNESCO World Heritage Centre · Derawan Islands, Tentative List submissionIndonesian Journal of Marine Sciences Universitas Diponegoro · Hard coral community structure Marabatuan and MatasirihMinistry of Marine Affairs and Fisheries · 87/KEPMEN-KP/2016: Derawan coastal and small-island conservation areaSabah Parks · Sipadan Island Park | Marine LifeGovernment of Brunei Darussalam / Forestry Department · Fourth National Report to the Convention on Biological Diversity: Brunei Darussalam
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Related discoveries

Activities

Diving below Barracuda Point, Sipadan, photographed in 2010.
Activities

Diving around Sipadan

Sipadan Island Park

Sipadan is a marine diving destination where reef structure and deeper water meet close to an oceanic island. For trained divers, the attraction is time underwater along reef edges and walls, watching how fish and larger marine animals use a changing three-dimensional environment. A visit is normally organised through an authorised dive operator, with accommodation elsewhere in the Semporna island area or on the mainland. That makes the permit allocation and dive arrangements the starting point of planning, rather than simply travelling to the island and expecting to buy a dive. This activity suits divers who want a focused marine day within a longer Sabah itinerary and who are prepared to match their experience to the operator's assessment of the sites and current conditions.

Connected with this habitat
Chen Wu from Shanghai, China · Wikimedia Commons · CC BY 2.0 · Cropped · Original
Coastal view on Derawan Island; this photograph shows the island setting, not an underwater reef.
Activities

Guided snorkelling around Derawan

East Kalimantan

Around Derawan, a reef visit begins where the island's shoreline gives way to shallow marine habitat. With a suitable local boat and guide, snorkelling offers a way to look closely at reef fish, coral formations and the changing colour of the water without undertaking a scuba-diving programme. Staying on or near the island lets you choose outings around local sea conditions instead of making the water visit the hurried end of a long transfer. This activity is best understood as a guided reef experience within the Derawan island setting, not a promise to visit every named island in the archipelago in one day. It suits confident swimmers interested in marine life and travellers who want a few focused hours in the water between slower periods ashore.

Connected with this habitat
Riza Nugraha · Wikimedia Commons · CC BY 2.0 · Cropped · Original

Attractions

Destinations

Sekonyer River in Tanjung Puting National Park, Central Kalimantan.
Destinations

Kalimantan

Indonesia

Kalimantan is the Indonesian part of Borneo, where five provinces invite five different starting decisions. Choose rivers and peat forests around Palangka Raya or Pangkalan Bun, city food and upper-Kapuas journeys in the west, Banjar river life and Meratus hills in the south, Mahakam heritage and Berau islands in the east, or coastal and highland travel in the north. The most useful question is which corridor deserves your time, not how many provinces can fit on a map. Travel usually combines an arrival city with separate road, river or island stages. Use the province summaries below to choose a starting point, then open its destination and activity pages for the actual visit.

Within this area
Nanosanchez · Wikimedia Commons · CC BY-SA 4.0 · Cropped · Original
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Nature areas

Coastal view on Derawan Island; this photograph shows the island setting, not an underwater reef.
Nature areas

Derawan coastal and island conservation area

East Kalimantan

The Derawan conservation seascape lies off Berau in East Kalimantan, linking island shores with reefs and coastal waters. It is larger than Derawan Island and is not a national park. Its value comes from connected marine habitats: an island beach, reef slope and surrounding waters are different parts of the same system. Visitors normally experience selected sites through an island base and a boat operator, rather than entering one bounded park gate. Choose the actual island and marine activity before arranging transfers. Some areas have conservation restrictions, and a tourism description of the archipelago does not establish unrestricted access to every reef, beach or turtle nesting site.

Related
Riza Nugraha · Wikimedia Commons · CC BY 2.0 · Cropped · Original
Beach and coastal shallows at Turtle Patch, Sipadan.
Nature areas

Sipadan Island Park

Sabah

Sipadan Island Park protects an oceanic island and its surrounding reefs off the southeastern coast of Sabah. Its small land area gives little sense of the underwater landscape: reef edges fall towards deep water, while coral communities support turtles, reef fish and larger marine animals. For most visitors the meaningful experience is a carefully organised day on the water, especially diving, rather than an island holiday spent sleeping on Sipadan itself. Overnight tourist accommodation on the island has been closed; visitors stay in Semporna or at another confirmed island base and travel with an authorised operator. Access requires planning around park permission, the activity offered and sea conditions. A booking described as a Semporna island trip does not automatically include Sipadan. Confirm the actual park day before building the rest of your coastal itinerary around it.

Documented occurrence in
Albert Kok · Wikimedia Commons · Public domain · Cropped · Original
Rambungan River mouth with Satang Kecil and Satang Besar islands in the distance, photographed in 2023.
Nature areas

Talang-Satang National Park

Sarawak

Talang-Satang National Park protects turtle nesting islands and surrounding marine habitats off western Sarawak. It is a conservation area with a limited visitor component, not a group of freely accessible holiday islands. The distinction between islands is essential: Sarawak Forestry allows ordinary day visits to the designated part of Pulau Satang Besar, while the Talang islands and other sensitive sites have separate restrictions. A visit can introduce the relationship between nesting beaches, coral communities and the wider sea, but it should not be sold as a guaranteed turtle encounter. Arrange the boat and permission context in advance, remain with the wardens where required and accept that marine conditions may change the programme. Mainland accommodation is the appropriate default for a normal day visit; specialist conservation participation is a different arrangement, not a way around visitor restrictions.

Documented occurrence in
Cerevisae · Wikimedia Commons · CC BY-SA 4.0 · Cropped · Original
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Species

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Tunku Abdul Rahman Park

Sources & references

UNESCO World Heritage Centre · Derawan Islands, Tentative List submissionAccessed: 2026-10-01

Ministry of Marine Affairs and Fisheries · 87/KEPMEN-KP/2016: Derawan coastal and small-island conservation areaAccessed: 2026-10-01

NOAA Ocean Service · Are corals animals or plants?Accessed: 2026-10-01

Corals of the World · Porites lutea species factsheetAccessed: 2026-10-01

Journal of Coastal Development Universitas Diponegoro · Growth rates of massive coral Porites lutea in BontangAccessed: 2026-10-01

Indonesian Journal of Marine Sciences Universitas Diponegoro · Hard coral community structure Marabatuan and MatasirihAccessed: 2026-10-01

Integrated Taxonomic Information System · Porites lutea taxonomic reportAccessed: 2026-10-01

Fisheries 2025 10(2):66 · Staying Close to Home: Horizontal Movements of Satellite-Tracked Reef Manta RaysAccessed: 2026-10-01

PLOS ONE 2022 · Reef manta ray population study in Komodo National ParkAccessed: 2026-10-01

World Register of Marine Species · Mobula taxon listAccessed: 2026-10-01

Sabah Parks · Sipadan Island Park | Marine LifeAccessed: 2026-10-02

IUCN assessment authors / ICAR-CMFRI repository · Cheilinus undulatus: Humphead Wrasse, IUCN assessment 2025Accessed: 2026-10-02

FishBase · Cheilinus undulatus: field guide species summaryAccessed: 2026-10-02

Marine Policy / study authors · Tackling illegal, unregulated, and unreported trade towards Humphead wrasse recovery in SabahAccessed: 2026-10-02

University of East Anglia / Tim Daw · Reef Fish Aggregations in Sabah, East MalaysiaAccessed: 2026-10-02

World Register of Marine Species / FishBase · Cheilinus undulatus Rüppell, 1835: taxon detailsAccessed: 2026-10-02

Government of Brunei Darussalam / Forestry Department · Fourth National Report to the Convention on Biological Diversity: Brunei DarussalamAccessed: 2026-10-02

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