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In page Circumnavigation:

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People have both bicycled and run around the world, but the oceans have had to be covered by air or sea travel, making the distance shorter than the Guinness guidelines.[citation needed] To go from North America to Asia on foot is theoretically possible but very difficult. It involves crossing the Bering Strait on the ice, and around 3,000 kilometres (1,900 mi) of roadless swamped or freezing cold areas in Alaska and eastern Russia. No one has so far travelled all of this route by foot. David Kunst was the first person that Guinness verified to have walked around the world between 20 June 1970 and 5 October 1974, by "[walking] 23,250 km (14,450 miles) through four continents".[10]