Susami, Wakayama


Susami is a town in Nishimuro District, Wakayama Prefecture, Japan.
As of October 1, 2016, the town had an estimated population of 4,011 and a density of 23 persons per km2. The total area is 174.71 km2.

Underwater mailbox

Off of the coast of Susami there is an underwater mailbox, which is an officially recognised mail collection point of Susami's postal system. It held the Guinness World Record for the deepest underwater post box, at 10 metres. It is used by divers who write water-resistant messages. It is said that during the busiest times it contains up to 200 pieces of mail a day.