There is a mailbox located underwater off the coast of Susami in Wakayama prefecture.
The mailbox is not some old sunken relic, but an actual mail collection point officially recognized as part of Susami’s postal system.
Each day the contents are collected from the box, which reportedly contains as many as 200 pieces of mail at the busiest times.
http://www.pinktentacle.com/2006/07/underwater-mailbox/
Too bad you can't drop off some dry cleaning while you are out with the mail.
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