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mountains and Shikoku mountains and formed the Seto Inland Sea as it is known today. From ancient times, the Seto Inland Sea served as a main transport line between its coastal areas, including what is today the Kansai region and Kyushu. It was also a main transport line between Japan and other countries, including Korea and China. Even after the creation of major highways such as the Nankaido and San'yodo,

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