Halmahera

Alfred Russel Wallace drew his famous biogeographic line through these waters — the invisible boundary where Asian species end and Australasian ones begin. On one side of Halmahera, you're in a world of Asian birds and mammals. On the other, paradise birds flash iridescent plumage and marsupials appear in the understorey. The island itself is shaped like a smaller, wilder Sulawesi — four peninsulas jutting into deep ocean, covered in primary forest that few outsiders have walked. Halmahera is the Wallace Line made physical.

Halmahera is the largest island in North Maluku, characterised by a distinctive multi-peninsular shape and some of eastern Indonesia's most extensive tracts of primary lowland and montane rainforest. The island sits on the Wallace Line — the biogeographic boundary separating Asian and Australasian fauna — giving it exceptional ecological significance. Bird species include Wallace's standardwing bird of paradise (Semioptera wallacii), found only on Halmahera and nearby Bacan, as well as Moluccan endemics. The island's interior remains largely roadless and undeveloped, with indigenous Tobelo and Galela communities maintaining traditional forest livelihoods. Historical sites include remnants of the sultanates of Ternate and Tidore's influence (Halmahera was historically under their control) and WW2-era Japanese fortifications. Access is via Ternate (30-minute ferry) or flights to Kao or Galela on Halmahera itself. Accommodation is basic — small-town hotels in Tobelo or Jailolo, and village homestays for jungle excursions.