is a city located in à Âita Prefecture, Japan. , the city had an estimated population of 15,492 in 7,666 households, and a population density of 190 persons per km<sup>2</sup>. The total area of the city is . Although it has the smallest population among the cities in à Âita Prefecture, it has the third highest population density after à Âita City and Beppu City.
Tsukumi is located in southeastern à Âita Prefecture, approximately 30 kilometers southeast of the prefectural capital at à Âita City. The eastern side faces the Bungo Channel and surrounds Tsukumi Bay, which is part of the Bungo Channel, from three sides, and the northern half of the Youra Peninsula on the south side of the bay and the southern half of the Nagame Peninsula on the north side.
Tsukumi has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Tsukumi is 15.6 ðC. The average annual rainfall is 1759 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.1 ðC, and lowest in January, at around 5.5 ðC.
Per Japanese census data, the population of Tsukumi has declined in recent decades.
The area of Tsukumi was part of ancient Bungo Province. According to legend Emperor Jimmu climbed Mount Suisho in Tsukumi and offered mandarin oranges to the people. Historical records indicate that mandarin oranges were cultivated in the area from around 740 AD. During the Edo period the area was divided between Usuki Domain and Saiki Domain. Following the Meiji restoration, the village of Tsukumi (æ´¥çµÂæÂÂ) within Minamiamabe District, à Âita was established on May 1, 1889 with the creation of the modern municipalities system. It was raised to town status on January 1, 1921, changing the kanji of its name to the present characters. It was raised to city status on April 1, 1951.
Tsukumi has a mayor-council form of government with a directly elected mayor and a unicameral city council of 12 members. Tsukumi contributes one member to the à Âita Prefectural Assembly. In terms of national politics, the city is part of the à Âita 2nd district of the lower house of the Diet of Japan.
The economy of Tsukumi is center around limestone quarries and cement manufacturing. West of the city is the Todaka Mine, one the biggest limestone quarries in Japan. The limestone is used in the Tsukumi cement plant owned by the Taiheiyo Cement Corporation.
Tsukumi has five public elementary schools and three public junior high schools operated by the city government. The city has one public high school operated by the à Âita Prefectural Board of Education.
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