"A beach can be defined as a stretch of sand longer than 20 metres and remaining dry at high tide. Based on this definition, the Coastal Studies Unit at the University of Sydney has counted 10,685 beaches in Australia."
Well, if that's your definition of beach, then it's true
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For a better source:
http://www.australia.gov.au/about-australia/australian-story/beach
"A beach can be defined as a stretch of sand longer than 20 metres and remaining dry at high tide. Based on this definition, the Coastal Studies Unit at the University of Sydney has counted 10,685 beaches in Australia."
Well, if that's your definition of beach, then it's true