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A Tokyo man is making a solo journey from Kennewick to Japan in a 20-foot sea kayak, the Tri-City Herald reports.

The man, 42-year-old Ryota Yamada, had to take shelter in Oregon a month into his trip down the Columbia River because of big, wind-whipped waves. He expects the journey to take him four summers.

He is hoping to complete the first leg of a 10,000-mile adventure across the Pacific Ocean and Bering Sea before foul weather arrives later this year.

After two years preparation, Yamada hopes to  prove that ancestors of Ainu or Jomon people from Japan could have paddled to North America thousands of years ago. “I believe (they) came like the Kennewick Man,” Yamada told the Herald.