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1. Valporquero cave is one of the most beautiful cave in Spain.

2. Águila cave is fifty millions years old, itś the oldest cave in Spain.

3. Gruta de las Maravillas

A shepherd discovered the Maravillas caves in 1886. Itś the first tourist cave in Spain. The cave has been visited from 1914.

4.  El Soplao cave was discovered by the miners.  Disabled people can visite this cave whithout any problem.

5.  Drach cave in Porto Cristo (Mallorca Island) is one of the most beautiful and important cave in Spain.

6. Jameos del Agua is in the North of Lanzarote Island near Corona volcano.

7. Altamira caves  in Santillana del Mar ( Cantabria) have got one of the most important example of cave art.

8.  Del Agua cave is one of the most interesting cavern in Spain.

9. Grutas de San José have got the longest navigable groundwater river in Europe.

10. Nerja cave is a  specially beautiful cavern. There are cave paintings inside it, too.

PARA ADRIAN.

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The Cave of the Treasure is one of the only three caves of submarine origin that are known in the world and the only one in Europe. It is located in the municipality of Rincon de la Victoria.
PARA ADRIAN.

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The cave of Altamira is a natural cavity in the rock in which one of the most important pictorial and artistic cycles of prehistory is preserved.
PARA ADRIAN

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The cave of Valporquero is located to the north of the province of Leon.
Open to the public since 1966 it is managed by the León Provincial Council. The visitable itinerary, 1,300 m long.
PARA ADRIAN

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1. -La cueva con mayor desarrollo (recorrido) del mundo es Mammoth Cave en Kentucky (usa) con 563Km.

2.  La de mayor desarrollo en españa es de 110Km, El Sistema de Ojo Guareña, en Burgos.

4. -La sima más profunda del mundo es Voronja en Abkhazia, Georgia, con -2140m.

5.  La sima más profunda de Europa es Lamprechstofen, Austria, con -1632m.

6.  La sima más profunda de España es la Torca del Cerro, Picos de Europa, Asturias con -1589m.

7.La estalagmita más grande del mundo está en China en la Cueva Zhi jin, de 70m.

PARA CARLOS.

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A cave or cavern is a natural cavity of the terrain caused by some erosion of streams, ice or lava, or less common, a combination of several of these factors.
ESTO PARA CARLOS.