Mondo Knows Facts

Mammoth Cave is the world longest recorded cave system

Located in Kentucky, Mammoth Cave contains over 680 kilometres of surveyed subterranean passages.

Carved out of limestone layers beneath sandstone caps, the cave system continues to reveal new interconnected passages every year. Early Indigenous peoples explored the upper passages thousands of years ago, leaving behind woven sandals and artefacts preserved by constant cave temperatures. It is protected as a national park and UNESCO site.

Historic Entrance (Mammoth Cave, Kentucky, USA) 33 (37136390543)
James St. John ยท CC BY 2.0 ยท licence ยท source

Where this comes from

National Geographic

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Tags: mammoth cave, kentucky, caves, geology

Mammoth Cave is the world longest recorded cave system: the short answers

Where does this come from, and can I check it?
Located in Kentucky, Mammoth Cave contains over 680 kilometres of surveyed subterranean passages. The figure is taken from National Geographic, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a world geography fact?
Yes. It sits on the World Geography shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?
The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.