I did not know such things even existed but sandfalls are actually real.
It seems that this is a relatively new phenomena and is caused by flooding or strong winds which causes sand to behave like a liquid, below is footage of this rare phenomena.

_{|Source|Footage captured in March 2017.}

Below is another clip that seems to be the result of strong winds but still quite the spectacle.

_|Source|

Fun Fact

Saudi Arabia has no permanent lakes or rivers but instead there are "Wadis" which are river beds that are completely dry or begin to flow after heavy rains.

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The Sandfalls of Saudi Arabia...

Fun Fact