article_snippet: But despite the appearance of an underwater waterfall along the coast of the island, it is really an optical illusion.
article_snippet: The illusion of the dramatic vortex has been created by a run-off of sand and silt deposits.
article_snippet: The optical illusion, off the south-west tip of the island, can be seen from a bird's eye view and is even present on Google maps.
article_snippet: Aerial view: The illusion can only be seen when looking from a bird's eye view and is even present on Google maps pictures .
highlights_snippet: But the vanishing waterfall is really an optical illusion caused by sand and silt deposits along the coastline .
  
highlights_snippet: Illusion can be seen from a bird's eye view on the island's south-western tip and is even present on Google maps .