| 31. | Dos Ojos lies broadly parallel to and north of the Sac Actun cave system.
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| 32. | Tours of the open cave system run every hour and last about two hours.
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| 33. | Large cave systems are not often found in this type of chemically unreactive rock.
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| 34. | The original cave diving exploration of the whole cave system began through these cenotes.
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| 35. | A third cave system, Jacob's Cave, lies to the northeast.
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| 36. | Large parts of the cave system were thus legally unprotected.
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| 37. | They also uncovered miles of passages in the Mageni cave system in New Britain.
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| 38. | This cave system has been mapped to about 12 kilometers.
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| 39. | Subterranean rivers may be entirely natural, flowing through cave systems.
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| 40. | It also has the largest cave system in Central America.
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