Photo - Balma del Quarto de Reixa
© Romang · CC BY 4.0, https://creativecommons.org/licenses/by/4.0/ · Wikimedia Commons · https://commons.wikimedia.org/wiki/File:Balma_del_Quarto_de_Reixa.jpg
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Coneguda balma murada a la Serra de l'Obac
Source: Espeleoindex (espeleoindex.com), modified. CC BY-NC 4.0, https://creativecommons.org/licenses/by-nc/4.0/