When many people think of lakes, they think of grayish-blue or grayish-green bodies of water - and that does describe the majority - but there are exceptions to that relatively drab rule. Colored bodies of water like Lake Hillier, Lake Pukaki, Lake Retba, Laguna Colorada, and Blood Falls can be pink, red, neon green, cyan blue, and even rainbow-colored. These wild colors aren't a fever dream - they're a very real natural phenomenon often caused by bacteria, sulfur, or algae.
Some of these lakes are safe to swim in, and others are too dangerous to get anywhere near - but all of them are visually stunning.
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Five Flower Lake Changes Color And Doesn't Freeze
Where It's Located: Jiuzhaigou National Park, China
Why It's Unusual: Nestled in the valley of the Tibetan Plateau is Jiuzhaigou National Park, a UNESCO World Heritage Site. Among the loveliest natural wonders in the park is Five Flower Lake. The lake has two unique properties: It changes color, and it doesn't freeze in the winter. At any given moment, the water could appear amber yellow, emerald green, dark jade or light turquoise. It might also be ringed with coral. The reasoning for this seems to be the lime, calcium carbonate, and multicolored hydrophytes that are contained within the lake.
As for its perpetually unfrozen state, that's because of an underwater hot spring that runs through the lake. Despite the scientific explanation, many of the local residents believe that the lake is holy.
Where It's Located: Yellowstone National Park, Wyoming
Why It's Unusual: The Grand Prismatic Spring is one of the many incredible sights you'll see when you travel to Yellowstone National Park. It's not a lake - actually it's a geyser that's 121 feet deep and has a diameter of 370 feet. In fact, it's so wide and so deep that when a person illegally flew a drone into the geyser, it was never seen again.
Its water, which is a brilliant blue, is ringed with bands of orange, yellow, and green. These layers exist thanks to thermophilic bacteria that live in the varying temperatures of different parts of the water. The middle is blue thanks to the scattering of blue light wavelengths.
Where It's Located: Mackenzie Basin, New Zealand
Why It's Unusual: Lake Pukaki is one of the most beautiful lakes in New Zealand - so much so that it was actually used as the setting for Lake Town in the live-action film The Hobbit. It was first formed when a receding glacier blocked its associated valley. Its distinct cyan color comes thanks to the melting glacier, which deposits glacial flour (finely ground rock found in the glacier) into the lake.
Where It's Located: Goldfields-Esperance, Western Australia
Why It's Unusual: Lake Hillier is a striking pink color that contrasts dramatically with the nearby Pacific Ocean. It was first discovered in 1802, but the reason for its pink hue is still not fully understood.
Most scientists studying the lake think it has something to do with the Dunaliella salina algae, which produce carotenoids, a pigment that's also present in carrots. However, some think the color might be thanks to the halophilic bacteria found in salt crusts, or a reaction between the salt and the sodium bicarbonate in the lake.
Despite the extremely high salt content of the lake, it's safe to swim in.