[Answer] Where is the longest cave system in the world found?

Step 1 : Introduction to the question "Where is the longest cave system in the world found?"

...Once the venue of primitive people, caves are today a favored tourist attraction and a study in biodiversity. Cave systems display a wide range in length and depth, with the longest cave in the world being Mammoth Cave. This jewel among cave systems measures 405 miles in length. You can visit Mammoth Cave when you pay a visit to Brownsville, Kentucky, in the U.S. The cave system is part of a national park and offers tours to visitors. Native Americans used some parts of the cave system as burial sites. Conservation efforts by the park maintain preservation of these sites. Source: WorldAtlas.com

Step 2 : Answer to the question "Where is the longest cave system in the world found?"

Kentucky, USA:

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