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Mexico · Geography · Hard

What is the name of the rare type of natural well found only in a handful of places on Earth, characterised by a perfectly round, deep shaft formed by the collapse of a limestone cave ceiling, most famously at Ik Kil near Chichen Itza?

Answer: Sotano — A sotano (basement) is a vertical shaft cenote; El Zacaton in Tamaulipas is the deepest known water-filled sinkhole in the world at over 339 metres.

A sotano (basement) is a vertical shaft cenote; El Zacaton in Tamaulipas is the deepest known water-filled sinkhole in the world at over 339 metres.

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