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Your Guide to Diving in the Forgotten Islands

Liveaboard adventures in the Southeast Moluccas

...Highlights: hammerhead sharks, shark action, manta rays, turtles, schooling fish & big pelagics, great macro life/ marine diversity...
...Dving environment: healthy reefs, drift diving, caverns, advanced divers, off the beaten track...

Nestled in the remote southeastern reaches of Indonesia, the Forgotten Islands are an alluring treasure for intrepid scuba divers seeking untouched reefs, dramatic drop-offs, and extraordinary marine biodiversity with both pelagic giants and rare macro life. This isolated region marks the border between the Banda Sea and the Arafura Sea, and remains largely unexplored due to its challenging accessibility, offering incredible dive sites far from the crowds. The islands stretch for just over 500 km from East Timor in the southwest to the northern islands of Tanimbar in the northeast. They can be divided into 2 distinct geological zones:

• The Inner Arc (volcanic) - Closer to the Banda Sea, this arc consists of younger, volcanic islands with rugged terrain and nutrient-rich waters. Key islands include Wetar (known for its active volcanoes), Romang (volcanic peaks and deep-sea trenches), Damar (aka Bebar - steep slopes and black sand dive sites), and Nila (aka Rumadai - uninhabited stratovolcano). These islands often feature adrenaline-pumping drift dives along sheer walls that bring encounters with schooling hammerhead sharks, swirling schools of barracuda, and patrolling dogtooth tuna, all swept by the nutrient-rich currents of the Banda Sea.

• The Outer Arc (non-volcanic) - Further south and east, these islands are older, composed of uplifted coral limestone and sedimentary rock, with gentler slopes and extensive fringing reefs. Key islands include Tanimbar (Yamdena, Selaru), Babar, and Kisar (shallow lagoons and WWII wrecks). The outer arc of the Forgotten Islands reveals a different diving wonderland. The coral-fringed islands of Tanimbar host manta ray cleaning stations where these graceful giants hover above vibrant reefs, while the atolls of Babar dazzle with some of the region's healthiest hard coral gardens, their crevices hiding pygmy seahorses and flamboyant cuttlefish. Unique muck diving sites around Kisar and Leti showcase the area's incredible biodiversity, with black sand slopes yielding blue-ringed octopuses, ghost pipefish, and other rare critters.

The ultimate frontier lies around uninhabited volcanic islands like Nila, where uncharted walls plunge into the abyss, promising encounters with deep-water pelagics and possibly undiscovered species. With visibility often exceeding 30m and no dive crowds, these remote islands deliver what might be Indonesia's last truly exploratory diving experiences, where every descent feels like a first discovery. The combination of pristine reefs, thrilling big animal encounters, and unparalleled remoteness makes the Forgotten Islands one of the world's most rewarding destinations for adventurous liveaboard diving.


Dive Site Descriptions


The Inner Arc




The Outer Arc




How to Dive the Forgotten Islands

The Forgotten Islands are 2 very remote chains in southeastern Maluku that stretch from East Timor in the southwest to Indonesian Papua in the northeast. They mark the division between the Banda Sea to the west and the Arafura Sea to the east. Indonesian liveaboards are the only practical way to dive here, typically departing from Ambon, Saumlaki, Tual, Alor, or Timor. Cruises are usually combined with dives in Alor, the Banda Sea, and Triton Bay (and occasionally Raja Ampat). There are no dive resorts here that can cover this large expanse of water.

Due to their extreme remoteness and challenging conditions, diving the Forgotten Islands requires careful timing and preparation. Liveaboards only operate during 2 short seasonal windows when the seas are calm enough for safe navigation: October-November and March-April. These waters are not for beginners. Strong currents sweep through many dive sites, and the nearest emergency support is often days away. Divers should have advanced training (or equivalent experience) with excellent buoyancy control, ability to handle strong currents, and self-reliant diving skills. But for adventurous divers, liveaboard trips in the Forgotten Islands deliver raw, expedition-style diving - the closest you'll get to discovering untouched reefs in the 21st century.

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The Diving Season

The Forgotten Islands offer prime diving conditions during 2 distinct seasonal windows each year when the open seas are calm enough for liveaboard operations. The primary diving season runs from October to November, when the shifting monsoon winds create ideal surface conditions and excellent underwater visibility. A secondary season occurs between March and April, when the weather transitions again to provide another period of calm seas suitable for diving expeditions. During these seasonal windows, divers may encounter different marine life migrations, with October-November often bringing manta rays to cleaning stations along the reef edges. The March-April period sometimes offers better chances to spot hammerhead sharks patrolling the deeper drop-offs.

Water temperatures remain consistently warm throughout both seasons, ranging from 26-30°C, while visibility typically reaches 20-40m when conditions are optimal. These narrow seasonal opportunities represent the only practical times to safely explore the Forgotten Islands' remote reefs, as the intervening months bring either dangerous sea conditions or poor visibility from plankton blooms. Mean air temperatures are pretty constant at 26-28°C (max. 33°C, min. 23°C). Rainy season is December to May, with the exception of April, which is dryer. September is the driest month of the year. Visit the Climates to Travel website for more details on the climate on Yamdena.


Where are the Forgotten Islands and How Do I Get There?

Our map below shows the location of the Southeast Moluccas (Maluku Tenggara) within the Indonesian archipelago. Find details on how to get to the Indonesian ports of departure, from where you will embark to the Forgotten Islands.

Map of Indonesia (click to enlarge in a new window)

Reef Summary

Depth

5 - >40m

Visibility

20 - 40m

Currents

Moderate - strong

Surface conditions

Can be choppy

Water temperature

26 - 29°C

Experience level

Intermediate - advanced

Number of dive sites

>100

Distance

~60 km east of Timor-Leste (3 hours), 550 southeast of Sorong (West Papua, 28 hours)

Recommended length of stay

10 - 14 days




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