Photo - Cova Bonica
© Martacani · CC BY-SA 4.0, https://creativecommons.org/licenses/by-sa/4.0/ · Wikimedia Commons · https://commons.wikimedia.org/wiki/File:Cova_Bonica_Vallirana._MC..jpg
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Cova de 20 metres de recorregut a Vallirana
Source: Espeleoindex (espeleoindex.com), modified. CC BY-NC 4.0, https://creativecommons.org/licenses/by-nc/4.0/