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<http://schema.org/description>
" Caves located above the source of Orbe. Caverns were created more than 150 million and currently consist mainly of calcium, clay, marl and sandstone. In their interior you can see characteristic rock formations. The caves were discovered in the second half. Of the 20th century. "
<https://tropter.com/en/switzerland/vallorbe/vallorbe-caves>