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, is the smallest of the four main islands of Japan. It is long and between wide. It has a population of 3.8 million, the least populated of Japan's four main islands. It is south of Honshu and northeast of Kyushu. Shikoku's ancient names include Iyo-no-futana-shima, Iyo-shima, and Futana-shima, and its current name refers to the four former provinces that make up the island: Awa, Tosa Province, Sanuki Province, and Iyo Province.
Mountains running east and west divide Shikoku into a narrow northern subregion, fronting on the Seto Inland Sea, and a southern part facing the Pacific Ocean. The Hydrangea hirta species can be found in these mountain ranges. Most of the 3.8 million inhabitants live in the north, and all but one of the island's few larger cities are located there. Mount Ishizuchi (石鎚山) in Ehime at is the highest mountain on the island. Industry is moderately well developed and includes the processing of ores from the important Besshi copper mine. Land is used intensively. Wide alluvial areas, especially in the eastern part of the zone, are planted with rice and subsequently are double-cropped with winter wheat and barley. Fruit is grown throughout the northern area in great variety, including citrus fruits, persimmons, peaches, and grapes. Because of wheat production, Sanuki udon (讃岐うどん) became an important part of the diet in Kagawa Prefecture (formerly Sanuki Province) in the Edo period.
The larger southern area of Shikoku is mountainous and sparsely populated. The only significant lowland is a small alluvial plain at Kōchi, the prefectural capital. The area's mild winters stimulated some truck farming, specializing in growing out-of-season vegetables under plastic covering. Two crops of rice can be cultivated annually in the southern area. The pulp and paper industry took advantage of the abundant forests and hydroelectric power.
The major river in Shikoku is the Yoshino River. It runs from its source close to Mount Ishizuchi, flowing basically west to east across the northern boundaries of Kōchi and Tokushima Prefectures, reaching the sea at the city of Tokushima. The Yoshino is famous for Japan's best white-water rafting, with trips going along the Oboke Koboke sections of the river.
Shikoku has four important capes: Gamōda in Anan, Tokushima on the easternmost point on the island, Sada in Ikata on the westernmost point. Muroto in Muroto, Kōchi and Ashizuri, the southern extreme of Shikoku, in Tosashimizu, Kōchi, jut into the Pacific Ocean. The island's northernmost point is in Takamatsu.
Unlike the other three major islands of Japan, Shikoku has no active volcanoes, and is the largest of Japan's islands to completely lack them. But Shikoku did experience volcanic activity in the distant prehistoric past; a major volcanic caldera in the area of Mount Ishizuchi was active during the Miocene around 14 million years ago and the small volcanic cone of Mount Iino at an unknown date.
| + List of 20 major cities in Shikoku | |
| 507,137 | |
| 414,363 | |
| 321,910 | |
| 250,150 | |
| 147,334 | |
| 113,755 | |
| 108,744 | |
| 102,830 | |
| 80,952 | |
| 68,213 | |
| 67,891 | |
| 60,106 | |
| 56,258 | |
| 53,368 | |
| 49,487 | |
| 45,763 | |
| 46,176 | |
| 39,352 | |
| 37,707 | |
| 35,288 |
Per Japanese census data, Ehime 1995–2020 population statistics and, Shikoku 1920–2000 population statistics Shikoku region's peak population was at 1950 and has had negative population growth from 1950 to 1970 and 1990 onward.
The "lost" Shikoku has been described by an American writer, Alex Kerr, who lived in a remote mountain village near Oboke (大歩危) for many years from 1970 onwards.
Ashizuri-Uwakai National Park is located in the south-west part of Shikoku.
Tokushima Prefecture also has its annual Awa Odori running in August at the time of the Obon festival, which attracts thousands of tourists each year from all over Japan and from abroad.
Kōchi Prefecture is home to the first annual Yosakoi festival. The largest festival in Kōchi, it takes place in August every year and attracts dancers and tourists from all over Japan.
The warm climate of Shikoku lends itself to the cultivation of citrus fruits. As a result, yuzu, mikan and other citrus fruits are plentiful on Shikoku and have become synonymous with the regions they are grown in.
The eastern gateway to Shikoku, Naruto in Tokushima Prefecture has been linked to the Kobe-Awaji-Naruto Expressway since 1998. This line connects Shikoku to the Kansai area which has a large population, including the large of Osaka, Kyoto, and Kobe. Therefore, the Kobe-Awaji-Naruto Expressway carries a large traffic volume. Many highway buses are operated between Kansai and Tokushima Prefecture.
The central part of Shikoku is connected to Honshu by ferry, air, and – since 1988 – by the Great Seto Bridge network. Until completion of the bridges, the region was isolated from the rest of Japan. The freer movement between Honshu and Shikoku was expected to promote economic development on both sides of the bridges, which has not materialized yet.
Within the island, a web of expressways and national highways connects the major population centers. These include Kōchi Expressway, Matsuyama Expressway, Takamatsu Expressway, Tokushima Expressway, Routes 11, 32, 33, 55, and 56.
Private railway lines operate in each of the four prefectures on Shikoku.
Sea Travel
Ferries link Shikoku to destinations including Honshu, Kyushu, and islands around Shikoku.
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