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Grottes de Bétharram : ウィキペディア英語版 | Grottes de Bétharram
The Grottes de Bétharram are a series of French caves located at the border of the Pyrénées-Atlantiques and Hautes-Pyrénées departments and of the Aquitaine and Midi-Pyrénées regions. Located near Asson, Lestelle-Bétharram and Saint-Pé-de-Bigorre, they offer a threeway discovery: by foot, by boat and finally, by train, the key to similar cave formation. The entrance is located in Asson and the exit in Saint-Pé-de-Bigorre.〔(Géoportail ).〕 == Description ==
A 2,8 km underground walk allows us to visit the three levels of river-dug galeries in the limestone mountain. The largest, upper part, formed by rooms openly accessible to each other, is namely interesting for its spongy ceilings, many of long range. The ancient riverbed that one then follows is a narrow and deep fissure where can be observed curious erosion phenomenons. The lower level corresponds to the present river level that one follows shortly by rowing boat. A 400 m long artificial tunnel brings us back to the surface. At the mountain's exit, the river joins the gave de Pau.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Grottes de Bétharram」の詳細全文を読む
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