Gunung Api
Also known as Gunung Wetar and not to be confused with the volcano with the same name in the Banda Islands, Gunung Api is a small volcanic island located approximately 100 km north of Wetar. It is uninhabited apart from by a huge number of frigate birds. The underwater topography features steep volcanic slopes and walls covered with soft and hard corals, sea fans, and sponges, and some hydrothermal vents that attract an abundance of marine life. Divers can encounter masses of sea snakes (banded kraits), and large pelagics such as reef sharks and hammerheads, tuna, mackerel, as well as schools of barracuda, trevally, and occasional sightings of manta rays.
Start the dive along the northwest wall, along the coral-covered slope, descending to where the wall drops into the abyss. The depth of the site ranges from 10-40m, with some section of the wall plunging deeper. Look for reef sharks patrolling the edge, bumphead parrotfish, black surgeonfish, fusiliers, and schools of jacks swirling in the blue. Mid-dive, explore the overhangs and small caves on the wall for octopus and macro life. Currents are moderate to strong, particularly around the island's drop-offs, making it ideal for drift diving. Gunung Api is best suited for intermediate to advanced divers due to currents and depth. The visibility here is typically 20-40m, though occasional thermoclines may reduce water clarity.
Wetar
Wetar is a rugged, sparsely populated island, just north of East Timor and marks the western end of the Forgotten Islands. Part of the Barat Daya Islands, this volcanic region remains one of Southeast Asia's least-explored dive destinations, offering pristine reefs, dramatic drop-offs, and exceptional biodiversity. The Ombai-Wetar Strait is a known migration route for whales and dolphins, offering potential for incredible encounters with these cetaceans. Wetar's underwater terrain is defined by steep walls, slopes of giant barrel sponges and sea whips, and hard coral gardens fed by nutrient-rich currents. The island's isolation has preserved its ecosystems, attracting large pelagics like hammerhead sharks, dogtooth tuna, and mackerel. Macro enthusiasts can spot rare critters such as pipefish, blue-ringed octopus, and tiger shrimp.
The Canyon is situated on the southern side of Goli Island, near Wetar Island. Descend along a coral-lined chasm to 35m where grey reef sharks patrol. Then explore the overhangs, swim-throughs, and cave for sleeping white-tip reef sharks, and admire the schools of fusiliers. End the dive drifting over a plateau of staghorn corals. The small islet of Reong has a current-swept wall where mantas and mobula rays circle cleaning stations. Focus on the ridge's pinnacles for action, then drift along the wall to spot eagle rays and bumphead parrotfish. Dive sites at Wetar are quite deep and currents are moderate to strong, making the island suitable to intermediate to advanced divers.
Romang
Pulau Romang is a small island located to the east of Wetar and is surrounded by several smaller islands, including Nyata to the northwest and Mitan, Tellang, Laut, Kital, and Maopora to the east. The region is remote, with unspoiled coral reefs, diverse marine life, and excellent visibility, making it an emerging destination for adventurous Indonesian liveaboard divers seeking untouched destinations.
Scuba diving around Pulau Romang itself and Nyata offers spectacular soft and hard coral gardens with excellent coral coverage, and large sea fans and barrel sponges decorating gentle slopes that descend in to Banda Sea. There are plenty of reef sharks, barracuda, trevallies, schools of fusiliers, and humpback snappers lurking in the shadows, while lucky divers may spot manta rays or eagle rays passing through deeper seas. Macro enthusiasts will find critters like Coleman shrimp often perched on fire urchins, colourful squat lobsters hiding in sponges, decorator crabs and spider crabs, egg cowries, as well as Ceratosoma trilobatum or Chromodoris annae nudibranchs. Bring a good torch and a keen eye for the tiny, weird, and wonderful!
At Mitan Island, a typical dive plan might begin where the sloping reef transitions into a wall dive at around 15m. After exploring the coral-covered wall, divers can drift along the reef edge, observing schooling fish and occasional reef sharks. Tellang is known for its shallower coral gardens and macro life, perfect for a relaxed, critter-focused dive. Divers can spot rhinopias, Randall's frogfish, black-saddled tobies, obscure Waspfish, and Schultz's pipefish. A dive at Laut Island might involve a deeper descent to 25 meters along a current-swept ridge, where pelagics are more common, before ascending to a shallower coral plateau for safety stops. Candy basslets, diagonal-banded sweetlips and eclipse butterflyfish can all be found here.
Damar
Damar is a volcanic island stretching roughly 20 km in length, flanked by 4 smaller, uninhabited islands. Located about 125 km east of Romang, this remote region is occasionally visited by passing sperm whales, reinforcing its untamed, off-the-grid allure. The reefs here remain pristine - so untouched that even the fish seem curious about divers. Massive, thriving coral formations, so familiar in the Forgotten Islands, dominate the underwater landscape.
To the south of Damar lies Terbang Utara ('North Island'), where deep waters and powerful currents create some of the most exhilarating diving in the region. Steep walls and thrilling drift dives attract manta rays, dogtooth tuna, and swirling schools of barracuda and trevally. Advanced divers may even encounter oceanic whitetip sharks patrolling the blue. Just south of Utara, Terbang Selatan ('South Island') offers equally dramatic seascapes but with slightly milder currents. Its rugged underwater terrain features sheer drop-offs and vibrant coral slopes, frequented by eagle rays, surgeonfish, and lumbering bumphead parrotfish.
To the west, the crescent-shaped Nus Leur presents a steep reef teeming with Napoleon wrasse, reef sharks, and clouds of fusiliers and midnight snapper. But the real magic lies in its macro diving: its shallow coral garden hide wonderpus octopus, rhinopias scorpionfish, ribbon eels, hairy frogfish, and delicate skeleton shrimp. Night dives bring Spanish dancers and hunting cephalopods to life under the beam of a torch.
Teun
Pulau Teun is a small, remote volcanic island located in the sapphire blue waters of the Banda Sea, roughly equidistant between Damar and Nila. It is located in the 'Ring of Fire', with underwater topography featuring steep walls, pinnacles, and vibrant coral gardens, and part of the triad of islands that are hotspots for hammerhead shark sightings - Teun, Nila and Serua (aka 'TNS').
Diving around Teun is an adventure reserved for experienced divers due to its strong currents, deep drop-offs, and remote location. Marine life is abundant, with the main attraction for divers visiting the Forgotten Islands being the frequent sightings of schooling hammerhead sharks. Descend 25m to a submerged pinnacle where hammerheads patrol, then drift along the numerous spurs and ridges and watch for reef sharks and mobula rays. Visibility is typically excellent (20-40m), though plankton blooms can reduce it seasonally. Currents here range from mild to very strong. Most dives at Teun are deep (18–40m), so proper buoyancy control and awareness are essential, especially this far out at sea.
Nila
Pulau Nila is a small, remote volcanic island located in the southeastern Banda Sea, northeast of Teun and southwest of Serua. This isolated region is renowned for its pristine reefs, dramatic underwater topography, and exceptional marine biodiversity. Scuba diving here offers a thrilling mix of steep drop-offs, vibrant coral gardens, and pelagic encounters, making it a bucket-list destination for experienced divers. The island sits within the famed Coral Triangle, and its nutrient-rich waters attract schooling hammerhead sharks, large schools of fish, reef sharks, and even occasional sightings of whales. When the dive in this part of the Forgotten Islands, you may feel as if you have reached the ends of the Earth and you will have an appreciation of how the region got its name!
Diving at Pulau Nila is characterised by strong currents, deep walls, and crystal-clear visibility, often exceeding 30m. The reef flats are covered in hard corals, sea fans, and giant barrel sponges, while the steep slopes plunge into the abyss, creating ideal conditions for pelagic action. Common marine life includes massive schools of surgeonfish, fusiliers, barracuda, bigeye trevally, snappers, emperors, reef sharks, and Napoleon wrasse. A typical dive plan involves descending along a wall or drift diving along a reef edge, staying mindful of currents. Divers usually explore depths between 18-30m, with safety stops back on top of the coral-covered flats that are covered with thousands of baitfish, olive sea snakes, sweetlips, goatfish, and butterflyfish. Night dives in a small bay on the east side of the island reveal a different world of crustaceans such as spider crabs and tiger shrimp, octopus, and hunting trevallies.
Nil Desperandum, a nearby submerged reef northeast of Pulau Nila, is famous for its adrenaline-pumping drift dives and shark encounters. The site features a seamount rising from the depths, attracting grey reef sharks, white tips, silkies, and frequent hammerheads. Schools of jacks and rainbow runners swirl around divers, while the reef itself hosts vibrant gorgonians and black coral trees. Currents can be strong, so divers often use a reef hook to stay in place and observe the action. A dive here typically starts with a negative entry to reach the seamount quickly, followed by a drift along the ridge before ascending up the reef slope.
Dusborgh Atoll is another submerged atoll with stunning coral gardens and thrilling drift dives. The atoll’s outer walls drop dramatically into the blue, offering chances to spot eagle rays, manta rays, and even passing tuna or wahoo. The shallower sections are filled with hard coral formations and anemones hosting clownfish, while the sandy patches may reveal blue-ringed octopus or flounders. Dives here often involve exploring the atoll's perimeter, riding mild to moderate currents, and finishing in the sheltered lagoon where turtles and reef sharks lurk.
The best time to dive Pulau Nila and its surrounding sites is during the dry season (October - November and April - May), when seas are calm and visibility peaks. Water temperatures range from 26-29°C, and most dives due to currents and depth.
Overall, Pulau Nila and its neighbouring reefs offer some of the most exhilarating and unspoiled diving in Indonesia, combining big pelagics, pristine corals, and thrilling underwater landscapes for those willing to venture off the beaten path. Forgotten Islands liveaboards are the only way to dive in this region. Strong currents, deep waters, and temperamental surface conditions require advanced diving skills.
Leti
Leti is a small, remote island in Indonesia's Maluku Barat Daya archipelago, situated near the Timor Sea and closer to Timor-Leste than to the central Banda Sea. It is located at the western end of the outer arc of the Forgotten Islands. Part of a cluster with Moa, Lakor, and Tombra, Leti is one of the least-visited dive destinations in the region, offering untouched reefs, dramatic limestone formations, and a unique mix of Banda Sea and Timor Sea marine life.
Leti's underwater terrain features steep coral walls, sloping reefs, and sandy muck-diving bays, making it ideal for both macro enthusiasts and reef explorers. Unlike the shark-heavy northern Banda Sea, Leti's waters are richer in rare critters and vibrant coral diversity, though pelagics still pass through. Healthy coral ecosystems dominated by table corals and gorgonian fans provide shelter for reef fish including anthias, butterflyfish, emperors, goatfish and reef squid.
Diving conditions around Leti are generally more relaxed than in the current-swept inner arc of the Forgotten Islands, with visibility ranging from 15-25m and water temperatures a consistent 27-30°C. Currents are typically mild to moderate, though stronger flows can be found near the channels between Moa and Lakor islands. A typical dive day here might begin with some fantastic muck diving in Tombra Bay's sandy slopes at 8-15m searching for rare macro life, followed by a drift dive along Leti's west wall at 18-30m to search for reef sharks and schools of trevally. More advanced divers can explore the deeper channels between Moa and Lakor islands (25-40m) where hammerhead sharks and eagle rays occasionally pass through. Night dives reveal mandarinfish and other nocturnal creatures.
The nearby islands of Moa and Lakor, while less dived than Leti itself, offer interesting variations. Moa's fringing reefs feature exceptional hard coral diversity and occasional pelagic action, while Lakor's channels can produce hammerhead sightings in the right conditions. What makes Leti truly special is its combination of untouched reefs, exceptional macro life, and complete absence of dive crowds.