[Answer] What is the world’s longest known cave system?

Step 1 : Introduction to the question "What is the world’s longest known cave system? "

...1. Mammoth Cave, Kentucky 2. Son Doong Cave, Vietnam 3. Kazumura Cave, Hawaii 4. Sac Actun Cave, Mexico

Step 2 : Answer to the question "What is the world’s longest known cave system? "

Mammoth Cave, Kentucky - The United States is home to the world's longest known cave system. Mammoth Cave in west-central Kentucky has more than 412 miles of surveyed passageways, and there may be quite a lot more — scientists estimate the cave stretches about 1,000 total miles. There are also more than 200 other caves nearby, many of which are fragments of the larger system. The cave system is part of Mammoth Cave National Park, established in 1941 to protect the underground labyrinth of caves, as well as the history and ecological richness they contain. Although the caves were only discovered by Europeans in the 18th century, humans visited them for thousands of years before that.:

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