The Cave of Swallows is one of the biggest natural depths of the world located in the town of Aquismón in the state of San Luis Potosi (Mexico). The depth of the abyss is about 376 meters, a Tour Eiffel could fix inside it. The top has a diameter close to the 60 meters, while the bottom has an aperture of nearly 300 meters. It has the characteristic of having the aperture smaller than the bottom, giving it a conical shape overall.

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