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Lake Hillier is a lake on Middle Island, the largest of the islands and islets that make up the Recherche Archipelago, Western Australia. It is particularly notable for its pink colour. The lake is thought to have been first visited by the Flinders expedition in January 1802. Flinders observed the pink lake after ascending the island's peak. John Thistle, the ship's master, collected some of the lake's water, which he found to be saturated with salt.
The length of the lake is about 600 metres (2,000 ft). The lake is surrounded by a rim of sand and a dense woodland of paperbark and eucalyptus trees with a narrow strip of sand dunes covered by vegetation separating it to the north from the Southern Ocean. From a distance, Lake Hillier of Australia's Recherche Archipelago looks like a swath of solid bubble-gum pink. Draw closer, and the color takes on a more watery, translucent quality, but remains unmistakably pink.
The most notable feature of the lake is its pink colour. It is such a significant distinguishing feature of the archipelago that air passengers often take note of it. The colour is permanent, and does not alter when the water is taken in a container. Although the source of the pink colour has not been definitively proven in the case of Lake Hillier, the pink colour of other salt lakes (e.g., Pink Lake) in the region arises 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. Despite the unusual hue, the lake exhibits no known adverse effects upon humans. From above, the lake appears a solid bubble gum pink, but from the shoreline it appears more of a clear pink hue. The shoreline is also covered in salt crust deposits.
Whereas the causes behind the unusual coloring of other pink lakes, such as the nearby Pink Lake and Senegal's Lake Retba, have been definitively confirmed, the reason for Lake Hillier's color remains a mystery. Theories abound, of course. Some speculate that Lake Hillier's color, like that of the other lakes, is the result of high salinity combined with the presence of a salt-loving algae species known as Dunaliella salina and pink bacteria known as halobacteria. Unlike other pink lakes, however, which regularly change colors in accordance with temperature fluctuations, Lake Hillier maintains its pink shade year-round. The water retains its pink hue when bottled.
Whatever the cause, the water does not appear to pose any danger to humans. Though high salt levels might not make for the most comfortable swim, visitors hoping to immerse themselves in Lake Hillier's brilliant pink waters are perfectly safe to do so.
Source : Wikipedia, atlasobscura.com
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The Blue Mountains is a mountainous region in New South Wales, Australia. It borders on Sydney's metropolitan area, its foothills starting approximately 50 kilometres (31 mi) west of the state capital. The area begins on the west side of the Nepean River and extends westward as far as Coxs River. Geologically, it is situated in the central parts of the Sydney basin.
Consisting mainly of a sandstone plateau, the area is dissected by gorges up to 760 metres (2,490 ft) deep. The highest point of the range is Mount Werong at 1,215 metres (3,986 ft) above sea level. A large part of the Blue Mountains is incorporated into the Greater Blue Mountains Area World Heritage Site, consisting of seven national park areas and a conservation reserve.
The Blue Mountains area includes the local government areas of the City of Blue Mountains, the City of Hawkesbury, the City of Lithgow and Oberon.
The Blue Mountains are a popular destination for Rock Climbers, Mountain Bikers and Hikers as well as canyoning and other adventure sports. These sports are well catered for by guiding companies and equipment stores located mainly in Katoomba.
Popular climbing destinations include the Centennial Glen cliffs near Blackheath, Mount Victoria, Mount Piddington and Mount Boyce. Climbing is currently banned on The Three Sisters.
Mountain biking takes place mainly on the many fire trails that branch away from the main spine of the Great Western Highway, such as Narrow Neck, Anderson's Fire Trail and others.
Likewise many of the fire trails are popular with day hikers, though many dedicated walking trails exist away from the fire roads
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