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The Republic of Nihonato 136 days ago Asahi Shimbun (English edition) Japan's islands double to more than 14,000 following new survey Japan is made up of many islands. Up to now, it was thought there were 6,852, based on a 1987 Japan Coast Guard report. However, when the Geospatial Information Authority (GSIA) of Japan recounted them recently for the first time in 36 years, the figure came to more than double that with 14,125. Using data from the Digital Japan Basic Maps, which are the basis for 1:25,000 scale topographic maps, a count was conducted of naturally formed islands with a coastline of 100 meters or more in length. Artificial islands created through land reclamation or other means were excluded. The sharp rise in the number of islands was mainly due to advances in surveying technology, including aerial photography, making it possible to get a clearer picture of complex coastlines, and identify islands that had not been counted as they were thought to be connected to land or cases where two separate islands were thought to be one. However, the GSIA this week stressed that the new figure reflected advances in surveying technology and the detail of the maps used for the count – it did not change the overall area of land in Japan’s possession. By prefecture, Nagasaki has the most islands with 1,479, including Iki, Tsushima, and the Gotō Islands. Hokkaidō comes a close second with 1,473 islands, followed by Kagoshima with 1,256. Tokyo’s administrative powers extend to both the Izu and Ogasawara Islands, so it ranks eighth with 635 islands.

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Asahi Shimbun (English edition)
Japan's islands double to more than 14,000 following new survey

Japan is made up of many islands. Up to now, it was thought there were 6,852, based on a 1987 Japan Coast Guard report. However, when the Geospatial Information Authority (GSIA) of Japan recounted them recently for the first time in 36 years, the figure came to more than double that with 14,125.

Using data from the Digital Japan Basic Maps, which are the basis for 1:25,000 scale topographic maps, a count was conducted of naturally formed islands with a coastline of 100 meters or more in length. Artificial islands created through land reclamation or other means were excluded. The sharp rise in the number of islands was mainly due to advances in surveying technology, including aerial photography, making it possible to get a clearer picture of complex coastlines, and identify islands that had not been counted as they were thought to be connected to land or cases where two separate islands were thought to be one. However, the GSIA this week stressed that the new figure reflected advances in surveying technology and the detail of the maps used for the count – it did not change the overall area of land in Japan’s possession.

By prefecture, Nagasaki has the most islands with 1,479, including Iki, Tsushima, and the Gotō Islands. Hokkaidō comes a close second with 1,473 islands, followed by Kagoshima with 1,256. Tokyo’s administrative powers extend to both the Izu and Ogasawara Islands, so it ranks eighth with 635 islands.

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