What country has the longest underground river?

In karst topography, rivers may disappear through sinkholes, continuing underground. In some cases, they may emerge into daylight further downstream. The longest subterranean river in the world is the Sistema Sac Actun cave system in Mexico.



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The Congo river, formerly known as the Zaire, is the deepest river in the world: at some points the water can be up to 220 metres deep; the basin has a surface area of 3,457,000 square kilometres.

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On November 11, 2011, Puerto Princesa Underground River was provisionally chosen as one of the New 7 Wonders of Nature.

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The Danube is Europe's second longest river, after the Volga. It is located in Central and Eastern Europe, flowing through 10 countries.

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Here is a list of five longest rivers of the world
  • Nile River: The longest river in the world.
  • Amazon River: Second longest and the largest by water flow.
  • Yangtze River: The longest river in Asia.
  • Mississippi-Missouri.
  • Yenisei.


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Let's take a look at the modern list of the Seven Wonders of the World:
  • The Great Wall of China. The Great Wall of China is the longest wall in the world! ...
  • Taj Mahal, India. ...
  • Petra, Jordan. ...
  • The Colosseum, Italy. ...
  • Christ the Redeemer, Brazil. ...
  • Chichén Itzá, Mexico. ...
  • Machu Picchu, Peru.


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Of the original Seven Wonders of the World, only one—the Great Pyramids of Giza—still exists. The Hanging Gardens of Babylon, the Lighthouse of Alexandria, the Temple of Artemis, the Colossus of Rhodes, the Statue of Zeus at Olympia and the Mausoleum at Halicarnassus have all faded to dust and memory.

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