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Did you Know? Japan is home to the world's deepest undersea postbox.
Susami is home to the world's deepest underwater mailbox, a fascinating Japan fact. Susami is a popular fishing village in Wakayama Province. In 2002, the town's deepest underwater mailbox was certified by Guinness World Records. Since 1999, the mailbox has gathered over 32,000 pieces of mail at a depth of 30 feet.