Halmahera

Halmahera is the largest island in North Maluku and one of Indonesia’s most undervisited dive destinations despite biodiversity numbers that rival Raja Ampat — over 450 coral species and 800 fish species recorded in surrounding waters. It sits at the geographic centre of the Coral Triangle, roughly halfway between Raja Ampat and Lembeh Strait, and combines three things that no single better-known destination offers together: an endemic walking shark described as a new species only in 2013, a pelagic-rich open-ocean seamount at Tifore, WWII airplane and naval wrecks at Morotai, and two of the original Spice Islands — Ternate and Tidore — with intact colonial forts and climbable volcanic peaks directly above the dive sites. Most days in Halmahera you will have the site entirely to yourselves.

The best season for Halmahera is October to May, aligned with Raja Ampat’s peak window — both destinations sit in the same regional weather pattern governed by the northwest monsoon. This period brings calmer seas, clearer visibility, and the most reliable conditions for Tifore’s open-ocean seamount dives. October to November is particularly good for reef shark and hammerhead activity at Tifore during seasonal upwellings. June to September is the off-season with stronger southeast monsoon swells affecting the outer sites, though sheltered reef sites inside the bays remain diveable. For crossing trips combining Halmahera with Raja Ampat and Lembeh, October to April is the logical window for all three destinations simultaneously.

Most Halmahera liveaboards depart from Ternate, served by Sultan Babullah Airport (TTE). Daily domestic flights connect Ternate to Jakarta (CGK), Bali (DPS), Makassar (UPG), and Manado (MDC), operated by Garuda Indonesia, Batik Air, and Wings Air. From Bali, the typical routing is Bali → Makassar or Manado → Ternate. For boats that depart from Halmahera itself rather than Ternate, operators arrange a short ferry crossing from Ternate to Sofifi on the Halmahera mainland. Arriving the day before embarkation is strongly recommended. Some crossing itineraries start in Sorong (Raja Ampat) and end in Ternate, or begin in Bitung near Manado — confirm embarkation and disembarkation ports with your operator.

The Halmahera walking shark (Hemiscyllium halmahera) was formally described as a new species in 2013 — one of the most recent additions to Indonesia’s list of endemic shark species. Like all epaulette sharks, it moves across the reef using its pectoral and pelvic fins in a walking motion rather than swimming, hunting small crustaceans and fish in the reef crevices at night. It is a small, completely harmless species — typically 60–70cm — and one of eight known walking shark species, all endemic to the region between Papua New Guinea and northern Australia. Weda Bay on Halmahera’s central east coast is the most reliable area to find it, typically on night dives or slow, patient reef dives during the day. An experienced local guide dramatically improves the chances of an encounter.

Tifore is a small island sitting on an open-ocean seamount midway between Halmahera and Sulawesi — one of the most productive pelagic dive sites in the North Maluku region. The seamount’s steep walls drop into deep blue water, and the strong upwellings that run along them concentrate food for large predators. Hammerhead sharks pass through during seasonal upwelling periods, mobula ray squadrons cruise the blue water off the walls, dogtooth tuna and schooling barracuda are present on most dives, and Napoleon wrasse patrol the reef crests. The site requires experience — currents are strong and variable — but for divers chasing open-ocean pelagic encounters in a destination with very few other boats, Tifore is one of the most rewarding sites in eastern Indonesia.

Morotai Island in North Halmahera served as a major Allied airbase during the Pacific War — it was from Morotai that General Douglas MacArthur planned the invasion of the Philippines in 1944. Several airplane wrecks from this period lie in shallow water around the island, now encrusted in coral and colonised by reef fish. The surrounding reefs host blacktip reef sharks, macro critters, and occasional manta sightings. Above water, remnants of the wartime base — runways, bunkers, and memorials — provide historical context during surface interval shore visits. Morotai also holds a unique place in postwar history: Japanese soldier Hiroo Onoda’s fellow soldier Teruo Nakamura continued fighting in the Morotai jungle until 1974, unaware the war had ended.

Ternate and Tidore are the two islands at the heart of the original Spice Islands trade — for centuries the world’s only source of cloves, the commodity that drove European colonial expansion across Southeast Asia. Portuguese, Spanish, Dutch, and British empires all fought to control these two small volcanic islands, and the history of that competition left a physical legacy that most liveaboard itineraries include. Fort Oranje on Ternate was originally built by the Portuguese in 1522 and later occupied by the Dutch, and remains one of the best-preserved colonial forts in eastern Indonesia. Fort Tahula on Tidore tells the Spanish side of the same story. Both islands have sultanates that remain culturally active, and the clove harvest that shaped world history still takes place on the hillsides above the dive sites.

Both sit within the same Coral Triangle biodiversity hotspot and have comparable species counts — Raja Ampat’s 75% of known coral species versus Halmahera’s 450+ coral species and 800 fish species. The key difference is infrastructure and visitor numbers. Raja Ampat has a well-developed liveaboard industry with dozens of boats and established sites. Halmahera has a fraction of the boat traffic, new sites still being explored each season, and a frontier quality that Raja Ampat lost as it became famous. Divers who have done Raja Ampat multiple times and want comparable biodiversity in a setting where they have the reef to themselves consistently find Halmahera rewarding. The addition of WWII wreck diving at Morotai, the Spice Islands history, and the Wallace’s standardwing bird of paradise excursion give Halmahera a distinct above-water dimension that Raja Ampat doesn’t offer.

Yes — the Raja Ampat to Halmahera to Lembeh crossing is one of the most compelling multi-destination itineraries in Indonesian diving. Running approximately 12–14 nights, the route departs from Sorong (Raja Ampat), crosses through Halmahera’s reefs and Tifore’s seamount, and ends at Bitung near Manado for access to Lembeh Strait’s world-famous muck diving. Each section offers a genuinely distinct underwater experience: Raja Ampat’s coral diversity and manta cleaning stations, Halmahera’s frontier reefs and endemic walking shark, and Lembeh’s unmatched muck diving and macro species list. The three destinations together represent the full spectrum of what Indonesian diving offers — coral reef, open ocean pelagic, and muck — and the crossing window of October to May aligns all three seasons.

Wallace’s standardwing (Semioptera wallacii) is a bird of paradise endemic to Halmahera and nearby Bacan Island, named for Alfred Russel Wallace who first collected specimens here in 1858. The male performs an elaborate courtship display, fanning large white plumes from his shoulders while calling from a display tree. Pre-dawn excursions from the boat are possible during anchorages at Weda Bay and the east coast — local guides lead short jungle treks to display trees in the hour before sunrise. The experience requires an early start but is one of only a handful of places on Earth where wild birds of paradise can be reliably seen. For wildlife photographers combining birdwatching with diving, Halmahera is one of the most productive single destinations in Southeast Asia.

Halmahera suits a range of experience levels depending on which sites are included. The majority of reef sites — Weda Bay, Tidore, Goraici Islands — involve gentle to moderate currents and are accessible to Open Water certified divers. Tifore’s seamount and Patinti Strait drift dives involve strong, variable currents and most operators require Advanced Open Water certification with 50+ logged dives for these specific sites. The WWII wrecks at Morotai are accessible to Advanced divers comfortable with exterior wreck diving. Night dives for the walking shark at Weda Bay are shallow and calm. Most Halmahera liveaboards carry mixed groups, with dive guides splitting by experience level for the current-swept sites.

Water temperature around Halmahera stays consistently warm at 27–30°C year-round — among the most stable of any Indonesian liveaboard destination. A 3mm wetsuit is comfortable for the vast majority of dives. Tifore’s open-ocean seamount can produce thermoclines in the deeper water column, occasionally dropping a few degrees during strong upwellings. Visibility across most of Halmahera’s sheltered reef sites is excellent at 20–30m. Tifore and Patinti Strait’s current-swept conditions keep the water clear and nutrient-rich. The volcanic black-sand sites around Ternate are occasionally silty but conditions settle quickly. Overall Halmahera offers warmer, calmer conditions than either its geographic neighbour Raja Ampat or Lembeh’s muck sites, making it a comfortable and forgiving dive environment despite its frontier character.