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Koyoshima island is an island floating in the Seto Inland Sea in Sakaide City, Kagawa Prefecture.
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🟦SDGs14 Life below water🐟
On Koyoshima Island, where high-quality granite is produced, the remains of a stone quarry that continued for over 400 years remain.
The stones here were also used for the stone walls of Osaka Castle during the 15th century.
In 1955, when the quarrying industry was at its peak, as many as 190 islanders lived there. There are currently two people.
Today, there are many ponds that were created by water that accumulated after the mining site.
In 1988, the 12.3km long Seto Ohashi Bridge was opened, connecting Kurashiki City, Okayama Prefecture and Sakaide City, Kagawa Prefecture.
One of the islands that served as the piers for the bridge was Yoshima, where Japan's first maritime expressway parking area was established.
In 1989, the year after the Seto Ohashi Bridge opened, Yoshima attracted 7.74 million tourists.
The luxury resort hotel, Aqua Koyoshima, was also built on Koyoshima island.
There was even a plan to build a ropeway between the islands and Yoshima, but once the boom ended, the number of tourists suddenly decreased. In the 1990s, the number decreased to 2.5 million people per year.
The hotel ``Aqua Koyoshima'' is rarely open, and as you can see, it is in ruins.