Unlike other pink lakes in the world like the one in Retba and the salt ponds at San Francisco Bay, the pink colour of Lake Hillier has not been decisively proved, although it is speculated that the colour could arise from a dye created by the organisms Dunaliella salina and Halobacteria. Another hypothesis is that the pink colour is due to red halophilic bacteria in the salt crusts. That the colour is not a trick of light can be proved by taking water from the lake in a container—the pink colour can be found to be permanent.
One of the first evidence of Middle Island's pink lake dates back to the journals of Matthew Flinders, a British navigator and hydrographer in 1802. Flinders had climbed Middle Island's highest peak (now known as Flinders Peak) to survey the surrounding waters when he came across this remarkable pink lake. Except for a few years when salt extraction was being carried out here, the island and its pink lake has been almost untouched and has since then provided visitors with one of the most amazing view of the world's natural wonder.
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