Masalembu Islands
The Masalembu Islands (Indonesian:Kepulauan Mesalembu) lie in the Java Sea to the north of Madura, about halfway between Madura and Borneo. They administratively form Masalembu District (kecamatan) of Sumenep Regency of Madura, in the Indonesian province of East Java. The Madurese language is spoken on the islands. The three main islands are Masalembu Island, Masakambing Island, and Karamian Island. The land area of the district is 40.85 square km, and they had a population of 20,687 people in the 2000 census, increasing to 21,705 at the 2010 Census[1] and to 25,809 at the 2020 Census.[2]

Main Islands
Masalembu Island
Masalembu Island is close to the equator, and have high capacity for biodiversity habitat, with corals reefs, mangroves, algae forests, and upwelling areas that acts as to sustain fisheries and other highly valuable economic activities.
Masakambing Island
Masakambing Island is about 10 miles from the north of Masalembu Island. The area of Masakambing Island is about 3.18 km2 inhabited by one village, Masakambing Village, with a population in 2000 reaching 1,268 inhabitants.
Keramaian Island
The island is about 29 miles from the north of Masalembu Island, has an area of about 9.79 km2 and is inhabited by one village, namely the Village of Kersatria, with a population in 2000 of 3,287 inhabitants.
References
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- http://sp2010.bps.go.id/files/ebook/3529.pdf
- Statistics Indonesia.