The Obi Islands (also known as Ombirah, Indonesian: Kepulauan Obi) are a group of 42 islands in the Indonesian province of North Maluku, north of Buru and Ceram, and south of Halmahera. With a total area of 3,048.08 km2, they had a population of 41,455 at the 2010 Census and 50,760 at the 2020 Census. The official estimate as at mid 2021 was 51,510. Geography Obi Island, also called Obira Island, is the largest island in the Obi Islands archipelago. It is surrounded by many small islands, including Bisa Island (174.42 km2), Obilatu Island (65.30 km2), Gata-gata Island, Latu Island, Woka Island, and Tomini Island. Obi Island is bordered by the Maluku Sea to the west, the Seram Sea to the south, and the Obi Strait to the north and east. The major islands closest to it are Bacan Island to the north and Ambon to the south. Obi Island's topography is generally in the form of hills with a short coastline. The hilly surface results in many springs and rivers. Lake Kapi, in the west, is its largest lake. Administration The Obi Islands are part of South Halmahera Regency. The archipelago is directly bordered by the rest of North Maluku Province to the north and west, by Maluku Province in the south and by West Papua Province in the east. The total area of the main island is about . Obi Island and the surrounding small islands are divided into five administrative districts (kecamatan), which are sub-divided into 34 administrative villages (desa and kelurahan), with villages further subdivided into hamlets. Of the five districts, three comprise the main Obi Island, although each district also includes neighbouring smaller islands - Obi District includes the southern part of Bisa Island to the north of Obi Island, Obi Timur District includes Tobalai Island to the east, and Obi Selatan Island also includes Gomumu Island to the south. The other two districts include no part of Obi Island; Obi Barat District includes Obilatu and Belangbelang Islands to the west of Obi Island, together with the southern part (Tapa desa) of Tapat Island, while Obi Utara District includes the main part of Bisa Island to the north of Obi Island, together with the northern part (Pasir Putih desa) of Tapat Island. Demographics The population of the Obi Islands Group was 51,510 people in mid 2021, with a population density of 16.90 people per square