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It is by the natural entrance that one reaches in an horizontal way one of the hugest subterranean rooms in France (140m x 50m x 25m).
The tourist walks throughout this huge cavity, in the middle of all kinds of alive crystal structures with natural strongly marked colours (stalactites, stalagmites, fistulous...).
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The second part, a former bed of subterranean river, shows you the most imposing concretions of the natural cave : calcite flow of 2 000m2 (unique because of its dimensions), majestic columns, draperies, crystalline lakes...
After having stayed one hour under the ground at a temperature of 10°C, the exit which is on a cliff shows a gorgeous panorama on the Gorges of Jonte.
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