France, Doubs, Merey sous Montrond, forest, karstic trail Grand Bois, the grottoes Green Porch

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Keywords: 1, bourgogne-franche-comte, cave, comte, day, doubs, east, erosion, europe, forest, formation, france, franche, geologic, geology, hiker, hiking, leisure, limestone, man, masculine, merey-sous-montrond, path, people, person, rock, sport, spring, tourism