The clearest body of freshwater known in the world is “The blue lake” or “Rotomairewhenua” in New Zealand. According to the NIWA research results, visibility in the lake is up to 80 meters (262 feet) meaning the water is considered almost as “optically clear” as distilled water.
The Amazon River initially flowed into the Pacific Ocean, but was dammed up by the newly formed Andes Mountains. The Amazon’s basin then became a giant lake until it eroded the sandstone to the west, letting the lake drain into the Atlantic and forming the modern river.

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