Differences Between Northern and Southern Islands
While at first glance the hundreds of islands spreading out in the bay off Sasebo may look similar, there are distinct geological differences between the islands to the north and those in the south. Generally speaking, these correspond to their position relative to the mouth of the Sazagawa River.
The islands north of the river mouth were formed relatively recently, while the southern islands are about 10 million years older. The age of the islands can be estimated from their shape and structure. The northern islands have a gentle shape, while those to the south have much steeper terrain, and are smaller and more numerous.
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Island to the north of the Sazagawa River
Island in the southern area
Sazagawa River
Northern Kujukushima islands
Southern Kujukushima islands