Halmahera
Indonesia · Maluku
Remote and rarely dived, Halmahera sits at the heart of the Coral Triangle and harbours extraordinary biodiversity including walking epaulette sharks, pygmy seahorses, and manta rays funnelling through the island's narrow passages. Its isolation has kept reefs in near-pristine condition.
How this reef is doing
ⓘ How we measure thisReef state
Live science signals for this reef are still being gathered.
Coral cover
Fish life
Heat
Fishing
Open to fishing, and the water is fairly quiet.
Sources · Global Fishing Watch and reef gravity
What you will see
25 species across the dive sites here
Blyth'S Hornbill
Seen Jun 2025
at Weda Bay Reefs
Least concern
Solomon Island Ground Boa
Seen Nov 2024
at Weda Bay Reefs
Least concern
Wallace'S Standardwing
Seen Aug 2024
at Manta Passage
Least concern
Banded sea krait
Seen year round
at Weda Bay Reefs
Least concern
Blacktip reef shark
Seen year round
at Dodola Island
Vulnerable
Bluefin trevally
Seen year round
at Manta Passage
Least concern
Bobtail squid
Seen year round
at Walking Shark Bay
Chevron barracuda
Seen year round
at Dodola Island
Least concern
Coleman shrimp
Seen year round
at Walking Shark Bay
Dog-tooth tuna
Seen year round
at Dodola Island
Least concern
Epaulette shark
Seen year round
at Walking Shark Bay
Near threatened
Fusilier
Seen year round
at Dodola Island
Giant trevally
Seen year round
at Dodola Island
Least concern
Mimic octopus
Seen year round
at Walking Shark Bay
Least concern
Oceanic manta ray
Seen year round
at Manta Passage
Endangered
Painted frogfish
Seen year round
at Weda Bay Reefs
Least concern
Porite coral
Seen year round
at Dodola Island
Least concern
Reef manta ray
Seen year round
at Manta Passage
Vulnerable
Satomi's pygmy seahorse
Seen year round
at Weda Bay Reefs
Sweetlips
Seen year round
at Dodola Island
Ivory-Breasted Pitta
Seasonal visitor
at Walking Shark Bay
Least concern
Mobula ray
Seasonal visitor
at Dodola Island
Vulnerable
Scalloped hammerhead shark
Seasonal visitor
at Weda Bay Reefs
Critically endangered
Thresher shark
Seasonal visitor
at Manta Passage
Endangered
Blue Flasher Wrasse
Rare sighting
at Manta Passage
Least concern
Dive sites
Manta Passage
oceanic manta ray · reef manta ray · thresher shark · bluefin trevally
Walking Shark Bay
epaulette shark · bobtail squid · coleman shrimp · mimic octopus
Weda Bay Reefs
satomi's pygmy seahorse · scalloped hammerhead shark · painted frogfish · banded sea krait
Dodola Island
dog-tooth tuna · chevron barracuda · porite coral · giant trevally