URL：https://upload.wikimedia.org/wikipedia/commons/thumb/6/64/Damage_to_Yamamoto_sea_dikes_observed_during_the_2011_EEFIT_mission.jpg/240px-Damage_to_Yamamoto_sea_dikes_observed_during_the_2011_EEFIT_mission.jpg
掲載元：https://commons.wikimedia.org/wiki/Category:Seawalls_in_Japan
