The Sermata Islands or Sematang Islands (formerly called Mdona Hyera), is a small group of islands within the Southwest Maluku Regency, part of Maluku (province) in Indonesia. The group is located south of the Damer Islands, east of the Letti Islands and west of the Babar Islands.

They originally formed the Mdona Hyera District (Kecamatan Mdona Hyera) within the regency, but by 2023 were renamed "Luang Sermata Islands" District. They consist of the main island of Pulau Sermatang and the much smaller island of Pulau Luang to its west, together with smaller islands situated between the two - notably Kelapa, Kepury and Tiara Islands. Other small and generally unpopulated islands form part of the district, including Liakra and Matumara Islands off Luang, Letutun and Lailawan to the west of the main group, Amoertaun and Meatiaram even further to the west, and Metimarang to the southwest.

Sermata Island had 4,003 inhabitants in mid 2023,"Badan Pusat Statistik 2024" resident in nine villages - Elo, Rumkisar, Lelang, Mahaleta, Romdara, Rotnama, Batugajah, Pupliora and Regoha. Luang Island consisted of two separate islands, together with a number of islets between them; the main sections are Luang Timur with 1,303 inhabitants, and Luang Barat with 1,059 inhabitants in 2023. The whole district covers a land area of 232.29 km2, and had 6,741 inhabitants in mid 2025.Badan Pusat Statistik, Jakarta, 27 February 2026, Kabupaten Maluku Barat Daya Dalam Angka 2026 (Katalog-BPS 1102001.8108)

Villages The Luang Sermata Islands District comprises eleven rural villages (desa), all sharing the postcode 97652, listed below with their areas and their populations as officially estimated for mid 2024.Badan Pusat Statistik, Jakarta, 26 September 2025, Kecamatan Kepulauan Luang Sermata Dalam Angka 2024 (Katalog-BPS 1102001.8108060)

KodeWilayah Name of kelurahan or desa Area in km2 Pop'nEstimatemid 2024 81.08.03.2001 Luang Barat 6.75 1,067 81.08.03.2002 Luang Timur 14.81 1,340 81.08.03.2003 Elo 23.42 785 81.08.03.2004 Rumkisar 28.69 347 81.08.03.2005 Lelang 32.22 568 81.08.03.2007 Romdara 16.91 401 81.08.03.2006 Mahaleta 24.52 473 81.08.03.2008 Rotnama 15.32 245 81.08.03.2009 Batugajah 21.20 358 81.08.03.2010 Pupliora 23.68 520 81.08.03.2011 Regoha 24.77 425 81.08.03 Total District 232.296,529 References