Nelson's Rotomairewhenua/Blue Lake, which has the clearest water in the world, is facing a threat from an invasive diatom that blooms into a slimy, clinging algae-like substance.
This New Zealand Lake Is the Clearest Body of Fresh Water Known to Man odditycentral.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from odditycentral.com Daily Mail and Mail on Sunday newspapers.