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Which natural phenomenon occurs over the mouth of the Catatumbo River where it empties into Lake Maracaibo?

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Correct answer: Atmospheric lightning storms

This extraordinary atmospheric show happens over the Catatumbo River where it meets Lake Maracaibo. For up to 160 nights a year, silent, brilliant lightning flashes continuously for hours. Curiously, this natural light show is so regular and bright that historical sailors used it as a natural lighthouse for navigation. Photo: Fernando Flores, Wikimedia Commons, CC BY-SA 3.0.

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Source: Wikipedia (CC BY-SA)

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