A Reddit user is frantically searching for answers after spotting a "yellow lake" on Google Maps.
The screenshot of the sight that is located around Liberty Farms in Columbus, Ohio, shows a large stretch of water with a bright white and yellow patch towards a corner of it.
Curious, the stunned user took to the forums and asked: "Why it is yellow? A place I found on Google Maps."
One user believes the lake is being used as a dumping ground from one of the businesses nearby.
They said: "I would love to know more about this as well. I did some googling and found that this is by Liberty Farms in Columbus, Ohio.
"It looks like there may be an industrial park nearby as well as a junkyard, but I wonder if the strip mine to the north is the culprit. There are several bodies of water in the area, but this is the only one with this happening.
"There appear to be two outlets that are dumping some sort of pollution or sediment or something into this water. This outlet in the photo is the worst. I would love to hear your take on it!"
They later added that upon more research, the nearby site is a limestone quarry.
Another said: "The yellow isn't likely from the runoff itself, but rather the bacteria the runoff feeds. This is more than likely algae growing off of the nitrogen from the nearby farm non-point source pollution.
"But there's a chance this could be some heavy metal pollution in which case I'd still say microbes are causing the colour but don't know enough to go beyond that."
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However, the phenomenon is known around the world in other highly polluted areas.
According to HydroTech, the sixth-longest river in the world, the Yellow River in China has been seriously polluted since 2007.
It's reported that up to 33% of its river system represents environmental pollution less than grade 5, ie unacceptable for animals and industrial production.
It is estimated that about 4.29 billion tonnes of waste are being discharged annually and it has become a yellow colour from the accumulated sediment that the river floats from mainly the central part of China.
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