Hillier Lake is a salt lake located on Middle Island, the largest island in the Recherche Archipelago, in the Goldfields-Esperance region south of the coast of Western Australia. It is particularly known for its pink waters.
Hillier lake is about 600m long and about 250m wide. It is surrounded by a layer of sand dunes and a dense eucalyptus and Melaleuca forest. It is located north-east of Middle Island and is separated from the north coast by a narrow strip of sand dunes covered with vegetation. The most obvious feature of the lake is its pink color. The color is permanent and does not alter if the water is collected in containers.
The reason for its pink color is still a topic under discussion, however most scientists say it is due to the presence of the green micro-alga Dunaliella salina and the presence of some species of halobacteria. Dunaliella salina produces carotenoids, a class of organic pigments that help to color the lake red-orange, therefore a proper balance between Dunaliella salina and halobacteria could be the reason for the pink color of the lake; other causes with lesser consensus could be the presence of halophilic bacteria in the salt crusts or a reaction between the salt and the baking soda found in water. Seen from above, the lake looks like a pink chewing gum.
Hillier Lake
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