Ōzu Issland, Island in Yamaguchi Prefecture, Japan
Ōzu Island is an island in the Seto Inland Sea located between Honshu and other major islands in the region. The island contains several small settlements and is characterized by granite quarries and traditional stonework operations.
The island served as a training and testing facility for the Imperial Japanese Navy's specialized submarine forces during World War II. Tunnel structures from that period remain visible on the island today.
The island's communities are shaped by stoneworking traditions, where masons pass down their craft techniques across generations. These skilled workers continue to define the character and identity of the settlements today.
The island is accessible by regular ferry services from Honshu, making it straightforward for visitors to reach. It is helpful to check ferry schedules in advance since service frequency is limited.
Granite from the island was used in the construction of Osaka Castle, contributing to the creation of this renowned structure. This legacy established the region as a recognized source for high-quality stone.
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