Kyushu (688) and Kansai (686) are not connected by land. At their closest they are 700m apart, which is comprarable to the width of the Bosporus. And it is only that wide for a brief stretch, not nearly as long as the Bosporus is that wide.
A strong navy should be able to block passage from Kyushu to Kansai. This land connection should be turned into a strait.
A strong navy should be able to block passage from Kyushu to Kansai. This land connection should be turned into a strait.
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