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New Zealand's Blue Lake: world's clearest body of fresh water  5nvklj





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New Zealand's Blue Lake: world's clearest body of fresh water

Dragon
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New Zealand's Blue Lake: world's clearest body of fresh water  Empty New Zealand's Blue Lake: world's clearest body of fresh water

Post by Dragon Tue Aug 17, 2021 3:57 am

Rotomairewhenua / Blue Lake is a small lake in Nelson Lakes National Park, in the northern reaches of New Zealand's Southern Alps.

Sacred to local Māori, it has the clearest natural fresh water in the world.

he Blue Lake is drained by the west branch of the Sabine River, which is part of the Buller River system.

It is fed by a short upper segment of the Sabine, which in turn is fed by underground seepage through the landslide debris impounding the much larger Lake Constance.

Blue Lake is roughly boomerang shaped, running north then northwest, with each arm of the lake stretching some 200 metres (700 ft). Its waters are cold, ranging from 5 to 8 °C (41 to 46 °F).

The lake has extremely clear water, and is the clearest natural body of fresh water yet reported.

A 2011 study found its visibility ranged from 70 to 80 metres (230 to 260 ft), clearer than the 63 metres (207 ft) measured for Te Waikoropupu Springs, a previous record holder.

For comparison, laboratory measurements show distilled water has a visibility of approximately 80 metres (260 ft).

Scientists attribute the lake water's clarity to its passage underground from Lake Constance, which filters out nearly all the particles suspended in the water.

Its clarity reveals water's natural blue-violet colour


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Last edited by Dragon on Tue Aug 17, 2021 4:11 am; edited 1 time in total


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New Zealand's Blue Lake: world's clearest body of fresh water  334pu7m
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Post by Dragon Tue Aug 17, 2021 4:00 am

New Zealand's Blue Lake: world's clearest body of fresh water  640px-Rotomairewhenua
Credit: Squashem

The algae and plant life in the lake make it look blue and green.


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New Zealand's Blue Lake: world's clearest body of fresh water  334pu7m
Dragon
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Post by Dragon Tue Aug 17, 2021 4:02 am

New Zealand's Blue Lake: world's clearest body of fresh water  640px-Blue_lake_Nelson_New_Zealand
Credit: Mergy

Blue Lake, Nelson, New Zealand in January, 2007


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New Zealand's Blue Lake: world's clearest body of fresh water  334pu7m
Dragon
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Post by Dragon Tue Aug 17, 2021 4:03 am



These astonishingly clear waters are regarded by the local Maori iwi / tribe as tapu or sacred, which means that humans are not permitted to enter the lake.

However, in early 2013, Danish photo-journalist and environmentalist Klaus Thymann was granted special permission by Māori, NIWA and New Zealand’s Department of Conservation to capture the clarity of the lake for conservation purposes.


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