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A video supposedly showing sand moving like water in the Allen Alkhai desert in Saudi Arabia racked up several million views after it was posted to the All About Geography Facebook page in May 2019: All About Georgraphy captioned the video: South of Saudi Arabian border ... This is not water ... This is Sand ... Yes sand. It’s called Allen Alkhai desert. However, there doesn't seem to be any arid region in Saudi Arabia called the Allen Alkhai desert. This video is likely referring to the Rub' al Khali desert, which covers portions of Saudi Arabia, Oman, the United Arab Emirates, and Yemen. This desert's name, however, isn't the only thing this Facebook page got wrong. The footage was not captured anywhere in Saudi Arabia, and it does not show desert sand moving in a water-like fashion. This video, shot in June 2011, instead shows a diver attempting to swim in Argentina's Nahuel Huapi Lake after it was filled with volcanic ash from the Puyehue Volcano in nearby Chile. The video, which was included in a contemporaneous news report from the Telegraph, was originally uploaded to YouTube by 'Isra Ramone: The Puyehue Volcano had lain dormant for decades before erupting in June 2011 and covering the area in a cloud of ash. The Atlantic reported on how the ash impacted the area: A photograph from Getty Images shows Lake Nahuel Huapi almost entirely covered in volcanic ash:
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