Pink Lake Hillier, Australia Lake Hillier is a bubble-gum-pink lake right on the edge of Recherché Archipelago’s largest island in Australia. It’s literally just a few steps away from a “normal” coloured Southern Ocean, but despite the pressure from its neighbour it refuses to compromise its pink colour. Scientists cannot figure out why Lake Hillier is pink, speculating that it’s caused by a reaction of sea salt and sodium bicarbonate (which ...