Shikoku

Island and region of Japan ShikokuNative name: 四国The island of Shikoku, JapanGeographyLocationSouthwest JapanCoordinates33°45′N 133°30′E / 33.750°N 133.500°E / 33.750; 133.500ArchipelagoJapanese archipelagoAdjacent toSeto Inland Sea (north)Bungo Channel (west)Kii Channel (east)Pacific Ocean (south)Area18,801.73 km2 (7,259.39 sq mi)Area rank50thLength225 km (139.8 mi)Width50–150 km (31–93 mi)Highest elevation1,982 m (6503 ft)Highest pointMount IshizuchiAdministrationJapanPrefecturesEhimeKagawaKōchiTokushimaLargest settlementMatsuyama (pop. 507,137(as of 1 May 2022))DemographicsPopulation3,486,739 (1 October 2025)Population rank23rdPop. density185/km2 (479/sq mi)LanguagesJapanese (Western Japanese — Awa, Tosa, Iyo and Sanuki dialects)Japanese SignEthnic groupsJapanese (98%)Additional informationTime zoneJapan Standard Time (UTC+9) Shikoku (四国, Shikoku; pronounced [ɕi̥.kó̞.kɯ̈̀, -kò̞.-] ⓘ, lit. 'four provinces') is the smallest of the four main islands of Japan. It is 225 kilometres (140 miles) long and between 50 and 150 kilometres (30 and 95 miles) wide. It has a population of 3.5 million, the least of Japan's four main islands. It is south