Certain rivers appear to flow uphill because of a clever optical illusion
Gravity hills create a mesmerizing trick of the eye where the surrounding landscape obscures the horizon, making a downward sloping stream appear to defy physics by flowing upward.
Gravity hills occur when the layout of the surrounding terrain creates an optical illusion that distorts our perception of the horizontal. Because drivers or hikers cannot see a flat horizon, their brains misinterpret a slight downhill slope as an incline.
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