Why are Banff lakes turquoise?

Glacier-Melt and Rock Flour The rock flour consists of finely ground rock sediments, primarily composed of minerals like silt, clay, and glacial till. These minuscule particles remain suspended in the water, scattering sunlight and giving it a unique turquoise or milky blue appearance.



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The secret ingredient, rather, is rock flour—also called glacial flour, which is made up of extremely fine rock particles. Rock flour was deposited in the Rockies during the last ice age and when suspended in lakes or rivers, it creates a milky, luminous turquoise color.

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As glacial meltwater carries sediments, it creates a suspension in the water, scattering light and causing it to appear blue. The combination of glacial milk and the reflective properties of the suspended rock flour particles results in lakes such as Lake Moraine and Lake Louise exibiting breathtaking shades of blue.

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Where is the most turquoise water in the USA?
  • Blue Hole – Santa Rosa, New Mexico.
  • Chena Hot Springs – Fairbanks, Alaska.
  • Las Olas Beach – Fort Lauderdale, Florida.
  • Grand Lake – Grand Lake Colorado.
  • La Jolla Cove – San Diego, California.
  • Sail Bay – San Diego, California.
  • Lake Conway – Edgewood, Florida.


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1. The Maldives. The Maldives, located in the Indian Ocean, have around 1,190 islands and sandbanks. A lagoon with crystal clear water encircles all the islands, which are protected by a reef structure that is home to an array of underwater life.

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Above the Sugar Loaf Dam west of Leadville, Colorado the Turquoise Lake is a man-made reservoir that sits around 10,000 feet of elevation in Lake County.

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The park's glacier-fed lakes provide spectacular photo opportunities, but most are much too cold for swimming. There are, however, a variety of public swimming facilities throughout the national park.

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Banff's drinking water consistently meets all standards set by the Guidelines for Canadian Drinking Water Quality.

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Technically yes, you can swim at Lake Louise, but it probably won't be for long. The water temperature rarely gets above 4°C, meaning you only have about 15 minutes or so until you become hypothermic.

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This MODIS image of blue water in the Caribbean Sea looks blue because the sunlight is scattered by the water molecules. Near the Bahama Islands, the lighter aqua colors are shallow water where the sunlight is reflecting off of the sand and reefs near the surface.

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THE MALDIVES This island nation is not the easiest place to get to, but its sheer beauty makes the journey worth it. Sitting between the Indian and Arabian seas, the Maldives' 1,000 coral islands are set in the clearest water in the world accompanied by the purest beaches.

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Lake Louise has always been renowned as one of the best hiking and mountaineering areas in Canada – offering a plethora of excellent summer trails for beginners and experts alike.

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