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Top 5 longest cave systems in the world

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The 5 longest cave systems in the world by total surveyed passage length: Mammoth Cave (United States), Sistema Ox Bel Ha (Mexico), and more.

Snapshot · 2026-11-09

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  1. 1

    Mammoth Cave (United States)

    685.6 km (426.0 mi)

  2. 2

    Sistema Ox Bel Ha (Mexico)

    541.7 km (336.6 mi)

  3. 3

    Shuanghedong Cave Network (China)

    440.9 km (274.0 mi)

  4. 4

    Sistema Sac Actun / Dos Ojos (Mexico)

    387.1 km (240.5 mi)

  5. 5

    Jewel Cave (United States)

    354.59 km (220.3 mi)