Why is Cornwall sea so clean?

And Cornwall's lack of major rivers is also a contributing factor. Hannah explains: “We have no major rivers to bring down lots of mud and silt, and it has been a very dry spring which has meant the streams are not washing mud into our bays and beaches.



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Hannah continues: “The clarity and turquoise colour in west Cornwall compared to say the North Sea or Bristol Channel is also because of the heavy sand particles which sit on the seabed, and lack of sediment swirling around in the water column.”

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The Weddell Sea has been claimed by scientists to have the clearest waters of any ocean in the world. Described by a historian as “the most wretched and dismal region on earth”, due to the flash freezes that caught Shackleton's ship, its clarity is only belied by the sheer depth of the ocean below.

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Lake Tahoe Known for its phenomenal clarity, this ancient lake has the purest waters in North America, making this The Clearest Lake in the United States. It offers visitors many options for exploring the gorgeous area as well.

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The sediment in Hawaii's oceans is made up of volcanic rock, coral, and shells which are heavy and not easily stirred up. The sediment quickly settles on the ocean floor, keeping the water clear.

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Cornwall is home to some of the best beaches in the UK and in the world, so it is no surprise that it is a popular location for sea swimming. Sea swimming has so many health and mental benefits, not only stimulating the body but allowing you to appreciate the wonderful surroundings we have in the UK.

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Generally the water quality is good in Cornwall. After periods of high rainfall, seawater can become contaminated with farmland or urban runoff. There is also the risk of sewage overflows releasing raw, untreated human waste into the ocean.

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The 9 most beautiful beaches in the US
  • Pfeiffer Beach, California. ...
  • Miami's South Beach, Florida. ...
  • Folly Beach, South Carolina. ...
  • Kill Devil Hills, North Carolina. ...
  • Siesta Key Beach, Florida. ...
  • Gulf Shores, Alabama. ...
  • Waikiki Beach, Hawaii. ...
  • Oxnard Beach Park, California.


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10 Places Where You Can See the Bluest Water in the U.S.
  • 01 of 10. Crater Lake, Oregon. ...
  • 02 of 10. Tenaya Lake, California. ...
  • 03 of 10. Devil's Den, Florida. ...
  • 04 of 10. Lanikai Beach, Hawaii. ...
  • 05 of 10. Lake Tahoe, Nevada and California. ...
  • 06 of 10. Molokini, Hawaii. ...
  • 07 of 10. Jenny Lake, Wyoming. ...
  • 08 of 10. Havasu Falls, Arizona.


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1. Blue Hole – Santa Rosa, New Mexico.

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1. Lake Baikal, Siberia. This lake plunges down to about 2,000 feet, making it the deepest lake in the world, as well as one of the freshest. The reason Lake Baikal is so fresh is due to it's volume.

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