Iki Island

Iki Island (壱岐島, Iki-no-shima), or the Iki Archipelago (壱岐諸島, Iki-shotō), is an archipelago in the Tsushima Strait, which is administered as the city of Iki in Nagasaki Prefecture, Japan. The islands have a total area of 138.46 square kilometres (53.46 sq mi) with a total population of 28,008. Only four (4) of the twenty-three (23) named islands are permanently inhabited. Together with the neighboring islands of Tsushima, they are collectively within the borders of the Iki–Tsushima Quasi-National Park.

Native name:
壱岐島, Iki-no-shima, Iki rettō
Iki-no-shima map.jpg
Map of Iki-no-shima
Iki in Nagasaki Prefecture Ja.svg
Map of Nagasaki Prefecture with Iki Islands in red
Iki is located in Japan
Location of Iki Islands
Iki is located in Nagasaki Prefecture
Iki (Nagasaki Prefecture)
Coordinates33°47′N 129°43′E / 33.783°N 129.717°E / 33.783; 129.717Coordinates: 33°47′N 129°43′E / 33.783°N 129.717°E / 33.783; 129.717
Adjacent bodies of waterTsushima Strait
Total islands4 inhabited, 18 total
Area138.46 km2 (53.46 sq mi)
Highest elevation212.9 m (698.5 ft)
Highest pointTakenotsuji
Population28,008 (2013)
Pop. density202/km2 (523/sq mi)
Ethnic groupsJapanese
Saruiwa of Iki Island


The Iki Islands are volcanic in origin: they are the exposed and eroded basaltic summit of a massive Quaternary stratovolcano last active over 400,000 years ago.

Iki Island is slightly oval in shape, and measures approximately 17 kilometres (11 mi) from north-south and 14 kilometres (8.7 mi) from east-west. The highest elevation is Takenotsuji (岳ノ辻), a weakly curved peak with a highest elevation at 212.9 metres (698 ft) above sea level. The average height of the land surface is 100 meters above sea level.

The archipelago is approximately 20 kilometres (11 nmi) north-northeast of the Kyushu coast at its closest point and southeast of the Tsushima Islands.


The Iki Islands have been inhabited since the Japanese Paleolithic era, and numerous artifacts from the Jōmon, Yayoi and Kofun periods have been found by archaeologists, indicating continuous human occupation and activity. In the Chinese Wèizhì Wōrén chuán (Japanese 魏志倭人伝, Gishi Wajinden), part of the Records of the Three Kingdoms dating from the third century, mention is made of a country called “Iki”, (一支国, Iki-koku), located on an archipelago east of the Korean Peninsula. Archaeologists have tentatively identified this with the large Yayoi period settlement of Harunotsuji, one of the largest to have been discovered in Japan, where artifacts uncovered indicate a close contact with the Japanese islands and the Asian mainland.

The islands were organized as Iki Province under the Ritsuryō reforms in the latter half of the seventh century, and the name Iki-no-kuni appears on wooden markers found in the imperial capital of Nara.

During the Heian period, the island was attacked by Jurchen pirates in the Toi invasion of 1019. Afterwards, the islands came under the rule of the Matsura clan, who developed trade and commercial relations between Goryeo in Korea, Tsushima, Iki and Kyushu. However, the islands were again devastated by the Kamakura period Mongol invasions of Japan in 1274 and 1281 during which time many of its inhabitants were slaughtered. Throughout the Muromachi period, the islands were a main base for the Japanese Wokou pirates, who plundered coastal settlements in Korea and China. Following the establishment of the Tokugawa shogunate in the Edo period, the islands came under the rule of Hirado Domain.

Following the Meiji Restoration, the islands became part of "Hirado Prefecture" from 1871, which then became part of Nagasaki Prefecture.

The islands were fortified with numerous coastal artillery batteries during World War II, but did not experience any combat. Remains of these fortifications can be found on the island of Wakamiyajima, north of the main Iki Island. On November 18, 1948, Lt. William Downham, from the USAF 36th Fighter Group stationed at Ashiya Air Field, experienced engine failure in his North American P-51 Mustang while patrolling the Korea Strait between Japan and the Korean Peninsula. He successfully parachuted onto Iki Island.[1]

In the 1960s and 1970s, in particularly the town of Iki, the islanders were notorious for overfishing, but blamed declining catches on the local species of whales and dolphins. In 1977, the local fishermen invited television companies to film the mass slaughter of dolphins. In response, activists heavily condemned the fishermen's acts of killing the dolphins.[citation needed] In view of the already endangered Japanese amberjack, the local town government banned large-scale, commercial fishing of Japanese amberjack after 1982.[citation needed]


Iki Island has ferry terminals in Ashibe, Ishida and Gōnoura, which connect Iki to mainland Japan such as Fukuoka and Kitakyushu. Located on the east coast Iki Airport connects the island to Nagasaki Airport in Nagasaki. The Japan National Route 382 connects the hamlets of the island together, and the bus company "Iki-kotsu" provides for public transport.


Photo Name Kanji Area
Population highest point
Peak Coordinates
  Iki Island 壱岐島 133.8 13,178 213 Takenotsuji 33°47′N 129°43′E / 33.783°N 129.717°E / 33.783; 129.717 (Iki-no-shima)
  Harushima 原島 0.53 140 33°43′23″N 129°38′56″E / 33.72306°N 129.64889°E / 33.72306; 129.64889 (Harushima)
  Nagashima 長島 0.51 170 33°43′38″N 129°37′53″E / 33.72722°N 129.63139°E / 33.72722; 129.63139 (Nagashima)
  Oshima 大島 1.16 200 33°44′17″N 129°38′5″E / 33.73806°N 129.63472°E / 33.73806; 129.63472 (Oshima)
  Wakamiyajima 若宮島 0.35 - 99.7 33°51′56″N 129°41′11″E / 33.86556°N 129.68639°E / 33.86556; 129.68639 (Wakamiyajima)
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  • National Geospatial Intelligence Agency (NGIA). Prostar Sailing Directions 2005 Japan Enroute. Prostar Publications (2005). ISBN 1577856511
  • "Iki Volcanic Group". Global Volcanism Program. Smithsonian Institution. Retrieved 2021-06-25.