Japan’s Underwater Postbox Sends Over 1,500 Letters a Year
The postbox in Susami Bay, installed in 1999 to attract tourists, is officially recognised by Japan Post and is reached by diving.

An underwater postbox fixed to the seabed off Susami, Wakayama, has sent over 1,500 letters a year since 1999 and is recognised by Japan Post.
An underwater postbox in Susami Bay, Japan, has been sending more than 1,500 letters a year since it began operating in 1999. Located off the coast of Susami in Wakayama Prefecture, it requires people to dive beneath the sea to post their letters.
Unlike conventional postboxes, which stand outside post offices or in public places, this one is firmly fixed to the seabed. Japan Post officially recognises it as a postbox for sending and receiving letters. It was installed in 1999 to promote tourism and attract more visitors to the area, and a social media post has described it as a tourist attraction.
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