Why is Lake Hillier Pink? The science behind Australia's candy-coloured lake
Lake Hillier, Australia's famous pink lake, continues to fascinate travellers and scientists. Here's a simple look at the science behind its candy-coloured water and why it stays pink.
If you’ve ever seen photos of Lake Hillier, you’ve probably wondered if they're real. The bright pink water of this pink lake in Australia looks almost artificial, but it isn’t. Located in the Middle Island in Western Australia, the lake has puzzled scientists for years. The science behind Lake Hillier's pink colour is now better understood, thanks to recent research.
The answer lies in tiny organisms that thrive in extreme conditions. From salt-loving bacteria to pigment-producing algae, this unusual mix creates the lake’s famous colour.
Here’s a simple explanation of why Lake Hillier is pink and what makes it so unique.
WHERE IS LAKE HILLIER?
Lake Hillier sits on Middle Island, off the southern coast of Western Australia.
What makes it stand out is the contrast. You have bubblegum-pink water right next to the deep blue Southern Ocean and green forest. It almost looks edited, but it’s completely natural.
WHAT MAKES LAKE HILLIER PINK?
The Lake Hillier pink colour comes from microorganisms living in the water.
Scientists have found that:
- Salt-loving bacteria like Salinibacter ruber produce red pigments
- Microalgae such as Dunaliella salina create beta-carotene (the same pigment found in carrots)
These pigments mix together and give the lake its pink shade.
It’s not dye, pollution, or chemicals, it’s biology doing its thing.
WHY DOES THIS HAPPEN HERE?
The key factor is salt.
Lake Hillier is extremely salty, up to 10 times saltier than the ocean.
This creates the perfect environment for “extremophiles,” organisms that survive in harsh conditions.
These microbes produce pigments to protect themselves from strong sunlight and UV rays. As a result, the water appears pink to us.
DOES COLOUR EVER CHANGE?
Unlike many other pink lakes, Lake Hillier is known for staying pink throughout the year.
However, scientists note that colour intensity can depend on:
- Salt levels
- Sunlight
- Water conditions
If the balance changes due to rainfall or environmental shifts, the colour may fade temporarily.
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WHY IS IT SO POPULAR?
Lake Hillier has become one of Australia’s most talked-about natural attractions.
It draws attention because:
- The colour looks unreal
- It remains pink even when water is taken out
- It shows how unusual ecosystems can be
It’s not just a travel spot, it’s also a place scientists study to understand life in extreme environments.