The March 2011 earthquake and tsunami, which killed nearly 19,000 people, left swaths of the northeastern Japanese coastline destroyed. Four years later, tens of thousands of people are still living in temporary housing.
Adding to the hardship is a nuclear catastrophe that has created a no-go zone around the Fukushima atomic plant.
During his stay in Tokyo, which began Thursday, William visited with the cast of a samurai TV show, performed a good-luck sake-barrel-breaking ceremony at a shopping mall and had tea with Japan's crown prince. He is scheduled to leave for China on Sunday.
After William on Friday laid a wreath at a grave for Commonwealth servicemen who died while held as prisoners of war in Japan, he signed a visitors' book. Next to the book was a framed photo of his mother laying a wreath at the same cemetery when she visited in 1995. Next to the picture were written the words: "May she rest in peace."
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William's trip to Japan's tsunami-devastated northeastern region, relatively unusual for a visiting foreign dignitary, follows in the path of his mother's humanitarian efforts.
Today, William visited with children in a playground in Fukushima, about 40 miles west of the meltdown-stricken nuclear reactors. The children were being allowed to play outdoors for the first time recently.
Previously, radiation levels had been too high for children, who are more susceptible to the health risks of radiation.Children scurried around William.
Abe has been eager to spread the message that the nuclear disaster has been brought under control, although some say problems remain with contamination from radiation and continuing leaks at the reactors.