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Susami, a fishing town in Wakayama Prefecture with a population of around 5,000, is in Guinness World Records for having the deepest underwater postbox, at a depth of 10 meters off its coast.

Officially recognized as a mail collection point of the local postal system, 1,000 to 1,500 pieces of mail are dropped into the box each year. Two hours by express train from the city of Wakayama, Susami has “an incomparably beautiful sea,” Hiroaki Yamatani, 37, manager of a diving shop in the town, said proudly.

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