Australia's Naturally Pink Lake

Nestled off the coast of Western Australia on Middle Island, Lake Hillier presents a breathtaking natural spectacle with its vivid, bubblegum-pink waters. This remarkable saline lake, approximately 600 meters long and 250 meters wide, was first documented in 1802 by British navigator Matthew Flinders, who noted its striking rose color and high salt content after observing it from the island's highest peak. The lake's distinct hue is permanent, a characteristic that sets it apart from many other pink lakes, as its water retains its vibrant shade even when collected in a container.

The captivating coloration of Lake Hillier is primarily attributed to the presence of specific microorganisms thriving in its hypersaline environment. The microalgae Dunaliella salina plays a significant role, producing red pigments known as carotenoids, particularly beta-carotene, as a protective response to the lake's extreme salt levels, intense sunlight, and high temperatures. Additionally, various halophilic bacteria, such as Halobacterium salinarum and Salinibacter ruber, found within the lake's salt crusts, also contribute to the pink and reddish hues by producing their own carotenoid pigments.

Lake Hillier boasts a salinity level comparable to that of the Dead Sea, making it roughly ten times saltier than the ocean. Despite its unusual appearance and high salt concentration, the lake's unique ecosystem is entirely safe for humans, and the microorganisms responsible for its color are harmless. Due to its isolated location within the Recherche Archipelago, the most popular and awe-inspiring way to experience the stunning contrast (Review) of the pink lake against the surrounding dense green eucalyptus and paperbark forests and the deep blue Southern Ocean is through scenic flights.