Molucca Sea Collision Zone in the context of Halmahera Plate

The Maluku Islands (/məˈlʊkuː, -ˈluː-/ mə-LUU-koo, -⁠LOO-; Indonesian: Kepulauan Maluku, IPA: [kəpuˈlawan maˈluku]) or the Moluccas (/məˈlʌkəz/ mə-LUK-əz; Dutch: Molukken [ˌmoːˈlʏkə(n)]) are an archipelago in the eastern part of Indonesia. Tectonically they are located on the Halmahera Plate within the Molucca Sea Collision Zone. Geographically located in West Melanesia, the Moluccas have been considered a geographical and cultural intersection of Asia and Oceania.

The islands were known as the Spice Islands because of the nutmeg, mace, and cloves that were exclusively found there, the presence of which sparked European colonial interests in the 16th century.

In the geology of the Philippines, the Philippine Mobile Belt is a complex portion of the tectonic boundary between the Eurasian plate and the Philippine Sea plate, comprising most of the Philippine archipelago. It includes two subduction zones, the Manila Trench to the west and the Philippine Trench to the east, as well as the Philippine fault system. Within the Belt, a number of crustal blocks or microplates which have been shorn off the adjoining major plates are undergoing massive deformation.

Most segments of the Philippines, including northern Luzon, are part of the Philippine Mobile Belt, which is bounded by the Philippine Sea plate to the east, the Molucca Sea Collision Zone to the south, Sunda plate to the southwest, and the South China Sea Basin to the west and north-west. To the north it ends in eastern Taiwan, the zone of active collision between the North Luzon Trough portion of the Luzon Volcanic Arc and South China. The Philippine Mobile Belt has also been called the Philippine Microplate and the Taiwan–Luzon–Mindoro Belt.

The Bird's Head plate is a minor tectonic plate incorporating the Bird's Head Peninsula, at the western end of the island of New Guinea. Hillis and Müller consider it to be moving in unison with the Pacific plate. P. Bird considers it to be unconnected to the Pacific plate.

The plate is separating from the Australian plate and the small Maoke plate along a divergent boundary to the southeast. Convergent boundaries exist along the north, between the Bird's Head and the Caroline plate, the Philippine Sea plate and the Halmahera plate to the northwest. A transform boundary exists between the Bird's Head and the Molucca Sea Collision Zone to the southwest. Another convergent boundary exists between the Bird's Head and the Banda Sea plate to the south.