Setouchi Japan

The Setouchi region (瀬戸内地方, Setouchi chihō), or simply Setouchi, is a geographic region of Japan. Setouchi includes the Seto Inland Sea and the adjacent coastal areas of Honshū, Shikoku, and Kyūshū, three of the four main islands of Japan.
 
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Seto Sea Islands

What is an island? Well, according to Wikipedia the answer is, an island or isle is a piece of land, distinct from a continent, completely surrounded by water. A Google search for the answer to this question further simplified the definition, stating that an island is simply, a piece of land surrounded by water. Either way, this was the criteria for estimating the total number of islands in the Seto Sea of Japan.

The number of islands in the Seto Sea is estimated to be somewhere between 700 and 3,000 islands....quite a range. This most likely takes into account even small groupings of rocks. For the purposes of this website, an island was only considered to be an island if it had a name when viewed on Google maps. I searched for a couple of weeks in putting this Seto Sea islands list together. While searching for islands, I came across hundreds of really small rock islands that are undoubtedly being included in the upper estimate range of 3,000 islands. I came up with a total of only 561 islands that had names which makes the 700 total islands estimate seem much more believable. There is no doubt I probably missed a few islands. If you happen to find islands not on the list, please message me at Facebook with the information. Thanks. Anyway, the following is the list of Seto Sea islands separated by region and then prefecture. Click the links for a list of islands for each prefecture.
 
Seto Sea Islands (561 Total)
 
Chūgoku Region

Okayama Prefecture - 60 islands
Hiroshima Prefecture - 92 islands
Yamaguchi Prefecture - 68 islands
Kyūshū Region

Fukuoka Prefecture - 5 islands
Ōita Prefecture - 33 islands
Shikoku Region

Tokushima Prefecture - 20 islands
Kagawa Prefecture - 89 islands
Ehime Prefecture - 136 islands
Kansai Region

Hyōgo Prefecture - 37 islands
Wakayama Prefecture - 21 islands
Osaka Prefecture - 0 islands
 
Chūgoku Region
Okayama Prefecture Islands

Okayama Prefecture, in the southern part of Japan’s Honshu island, is known for its mostly rural landscapes, feudal castles and several notable art museums. It’s also a gateway to Shikoku Island via Seto Ohashi Bridge. The capital, Okayama City, is home to Korakuen, a formal garden completed in 1700, and 16th-century Okayama Castle, also dubbed the “Raven Castle” for its distinctive black exterior.

Seto Sea islands in Okayama prefecture

Google Map - a map of the land area and islands of Okayama prefecture (new tab)
Hiroshima Prefecture Islands

Hiroshima prefecture, on Japan’s main island Honshu, is bordered by the Seto Inland Sea to the south and the Chūgoku mountains in the northwest. The capital, also called Hiroshima, is a modern city known for its Peace Memorial Park and Genbaku Dome, the surviving ruins from the only area building still standing after World War II's 1945 atomic bombing.

Seto Sea islands in Hiroshima prefecture

Google Map - a map of the land area and islands of Hiroshima prefecture (new tab)
Yamaguchi Prefecture Islands

Yamaguchi is a prefecture in Japan's Chugoku region, on the southwest side of Honshu Island. The capital city, also called Yamaguchi, dates to the 14th century, when a lord designed it to look like "The Kyoto of the West." The pagoda-topped Rurikō-ji Temple is in Kozan Park, nearby the burial site of the Mori family, who ruled during the Edo Period.

Seto Sea islands in Yamaguchi prefecture

Google Map - a map of the land area and islands of Yamaguchi prefecture (new tab)
Kyūshū Region
Fukuoka Prefecture Islands

Fukuoka is a prefecture on Japan’s main island of Kyushu whose capital, Fukuoka city, was formed from a castle town. Edo-period fortress ruins can still be seen among Maizuru Park’s cherry blossoms. Modern-day Fukuoka is also known for its elaborate float races during Hakata Gion Yamakasa festival, and for its open-air food stalls, or yatai, selling specialties such as yakitori chicken skewers.

Seto Sea islands in Fukuoka prefecture

Google Map - a map of the land area and islands of Fukuoka prefecture (new tab)
Ōita Prefecture Islands

Oita is a coastal prefecture on Japan’s Kyushu Island. It's best known for its onsen (hot springs), including popular Beppu. Its famous “Hells of Beppu” are 8 steaming thermal pools, including Chinoike Jigoku, with red water, and Tatsumaki Jigoku, featuring a geyser. Nearby Yufuin, another hot springs town, lies at the foot of twin-peaked Mt. Yufu, a 1,583m-high hiking and climbing destination.

Seto Sea islands in Oita prefecture

Google Map - a map of the land area and islands of Oita prefecture (new tab)
Shikoku Region
 
Tokushima Prefecture Islands

Tokushima Prefecture, on the eastern end of Japan’s Shikoku Island, is linked by bridge to mainland Honshu. It’s the traditional starting point of an island-wide pilgrimage route, which stretches 1,200km and encompasses 88 Buddhist temples (more than a quarter of them in Tokushima). The prefecture's remote Iya Valley, part of Tsurugisan Quasi-National Park, has steep gorges, river rapids and vine suspension bridges.

Seto Sea islands in Tokushima prefecture

Google Map - a map of the land area and islands of Tokushima prefecture (new tab)
Kagawa Prefecture Islands

Kagawa is a Japanese prefecture in the northeast of Shikoku Island, between the Sanuki Mountains in the south and the island-dotted Seto Inland Sea in the north. It’s the end point of the Shikoku Pilgrimage route, which passes 88 Buddhist temples. The capital, Takamatsu, is a port city home to the feudal Takamatsu Castle and Ritsurin Garden, a landscaped park built in the Edo period, with koi ponds and a teahouse.

Seto Sea islands in Kagawa prefecture

Google Map - a map of the land area and islands of Kagawa prefecture (new tab)
Ehime Prefecture Islands

Ehime is a Japanese prefecture covering the northwest quarter of Shikoku Island and dozens of smaller islands in the Seto Inland Sea. In Matsuyama, the prefectural capital, a cable car and chairlift rise to Matsuyama Castle. Established in the 1600s, the castle is set on a plateau in verdant grounds. Dogo Onsen is one of Japan’s oldest hot springs, with a spa resort centered on its 19th-century public bathhouse.

Seto Sea islands in Ehime prefecture

Google Map - a map of the land area and islands of Ehime prefecture (new tab)
Kansai Region
Hyōgo Prefecture Islands

Hyōgo is a Japanese prefecture in the Kansai region of the country’s main island, Honshu. Kobe, the prefectural capital, is a cosmopolitan port city framed by mountains, west of Osaka and Kyoto. It has a busy Chinatown and an animated entertainment district around Sannomiya Station. Kobe Harborland offers upscale shops and waterfront views, while local steakhouses specialize in the area's signature Kobe beef.

Seto Sea islands in Hyōgo prefecture

Google Map - a map of the land area and islands of Hyōgo prefecture (new tab)
Wakayama Prefecture Islands

Wakayama is a Japanese prefecture in the Kansai region, on Honshū island's Kii Peninsula. Its namesake capital is home to Wakayama Castle, an Edo-period replica set in a hilltop park with city views. Pilgrimage routes connect a trio of Shinto shrines collectively known as Kumano Sanzan. More than 100 temples rest among the peaks of Mount Kōya, where Shingon Buddhism is headquartered.

Seto Sea islands in Wakayama prefecture

Google Map - a map of the land area and islands of Wakayama prefecture (new tab)
Osaka Prefecture Islands

Osaka Prefecture is a prefecture of Japan located in the Kansai region of Honshu. Osaka Prefecture has a population of 8,778,035 and has a geographic area of 1,905 square kilometers.

Seto Sea islands in Osaka prefecture

Google Map - a map of the land area and islands of Osaka prefecture (new tab)
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