File:TsunamiStoneImage004.png

Historical stone at Japan with warning about Tsunami; such stones indicate the tsunami–safe level for the constructions. Homes built-up above this level were not destroyed at Tsunamies.

The honest use is assumed, the source should be attributed: http://tamutamu2011.kuronowish.com/kokoyorisitani.htm

at 2018, the image is already not available at that URL.