Saiki City

Oita Prefecture · City

Saiki City, at the southeastern tip of Oita Prefecture, has the largest area of any municipality in Kyushu. This castle town of the Saiki Domain is so rich in seafood that people said "the lord of Saiki lives off the bays," and fresh sushi is a specialty. Cape Tsurumi on the Bungo Channel and the ria coast's islands are attractions.

Key facts

Population: 60,646 428th in Japan2025 Census
5-year change: −9.3% 588th in Japanfrom 66,851 in 2020
Area: 903 km² 43rd in Japan
Population density: 67 people/km² 1,194th in Japan

Source: Statistics Bureau of Japan, 2025 Population Census (population, area and density); area from the Geospatial Information Authority of Japan (GSI), Area Statistics of Prefectures and Municipalities (2025). National ranks are among the 1,741 municipalities, ordered by this site from these values.

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Chosen automatically, most popular first, from landmarks and cultural properties registered in Wikidata (we have not checked whether each is open). Names and descriptions: Wikidata (CC0); photos: Wikimedia Commons (photographer and license under each photo).

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Municipalities sharing a boundary (computed from the National Land Numerical Information administrative boundaries, January 2021).

Other municipalities in Oita Prefecture

The description was written for this site, picking out representative features.

Figures come from official Japanese statistics (such as the 2025 Census by the Statistics Bureau of Japan), with the source and year shown next to each one. Photos are freely licensed images from Wikimedia Commons; the photographer and license are shown under each photo.

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