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Grotte Casteret
The Grotte Casteret, also known by its Spanish name Gruta Helada de Casteret, is a limestone ice cave, located high in the Spanish Pyrenees, within the Ordesa y Monte Perdido National Park. Discovered in 1926 by Norbert Casteret, it is known for its Grande Salle (Great Hall) which has a frozen lake some in area, its ice formations, and a ice wall into a second chamber.
==Description==
The Grotte Casteret is situated at the top of a scree / snow coloir ESE of the Brèche de Roland, and has an impressive entrance porch some wide, and high. After the passage opens out into the vast ice-floored Grande Salle, about long, wide, and high. Its floor is a frozen lake of clear ice with a surface area of about . Large ice columns dominate the end of the chamber. To the left of the chamber an opening leads into the Salle Maude at the base of a ice-wall called Niagara.〔St. Pierre (2007)〕
Beyond the Grande Salle, the ice floor gives way to a mainly boulder-floored passage which leads after leads to a climb which emerges in a lapiaz field on the surface. Casteret's original survey shows the passage extending for a further , but this is no longer accessible.〔
A third entrance, the Puits Florence, lies on the plateau above the cave. It is deep, with the final being a vertical shaft entering the Grande Salle.〔St. Pierre (2007), pp. 16〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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