[Answer] Where is the world’s longest cave system by distance?

Step 1 : Introduction to the question "Where is the world’s longest cave system by distance?"

...Kentucky’s Mammoth Cave is the world’s longest by distance. It stretches across 400 miles of explored cave, and, according to park estimates, there are another 600 miles left to discover. Mammoth Cave National Park, established in 1941, draws more than 2 million visitors every year.

Step 2 : Answer to the question "Where is the world’s longest cave system by distance?"

Kentucky:

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