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In March 2017, a video appeared showing what it termed a sandfall, a phenomenon in Saudi Arabia in which sand purportedly behaves like water pouring over a cliff: https://youtu.be/EKfOWtTDNT0The video attracted accusations that the footage was faked, with some viewers claiming that Niagara Falls had been superimposed over a video of the Saudi Arabian desert. The earliest version of the video we could find was posted to the Instagram page @tausiyahcinta_ in April 2016, and according to its description, it was taken just south of Riyadh in a village called Al Aflaj. We were able to locate several other videos showing sandfalls near Riyadh. For example, the following video was posted in April 2013: https://youtu.be/VqUnBlxu3BwThe videos were all accompanied by titles or descriptions stating that these falls are located near Riyadh, Saudi Arabia and that the sandfalls were the result of heavy rains: Saudi Arabia does not have many permanent rivers, but the county does have wadis, or dry riverbeds, that can flood after a heavy rain. These videos, then, show an actual waterfall that formed after a flood, and that is carrying a lot of sand: https://youtu.be/9Q5jlh_aptQAccording to at least one editorial, these waterfalls in Saudi Arabia are relatively new and are likely the result of climate change:
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