Clearest water

Last updated: March 30, 2020 at 15:59 pm

80 m (262 ft) or the approximate visibility of distilled water. A few locations are claimed to equal the visibility of distilled water, including the Silfra Fissure in Iceland, the Weddell Sea (Antarctica), New Zealand’s Blue Lake (a.k.a. Rotomairewhenua), and some Mexican cenotes. Claims of visibility surpassing 80 metres anywhere are likely overstated. However, the Weddell Sea has the added distinction of being composed of seawater that is teeming with life, including plankton.

National Institute of Water and Atmospheric Research (NIWA).
W.W.C. Gieskes, C. Veth, A. Woehrmann and M. Graefe, EOS, 1987.
Witnessed by Diving Almanac & Book of Records official (Silfra, Iceland).
World’s clearest water | Tectonic dive and trolls in Iceland

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