When did Sydney Harbour become a unit of measure?

Last night I was watching TV and the presenter was describing an area as being “Five Sydney Harbours!” Wherever we go tour guides love to quote their particular waterway as being “X amount of Sydney Harbours”. We hear this so often that I’m beginning to think that Sydney Harbour is quite small.

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Lake Argyle, WA – Seventy Sydney Harbours!

 

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