The largest natural cave in Galicia, located in Supena (Argomoso) near Mondoñedo, extends over 6,500 metres. Its labyrinthine karstic structure, with slate, houses impressive stalactites and stalagmites. With a drop of up to 75 metres, it contains internal waters that feed lakes and an underground river, the Celtas, at its bottom.
Activities included:
- Visit to the Cave of King Cintolo.
- Restaurant food in Mondonedo.
- Guided tour in Mondoñedo or hiking route in Mariña, Lugo.