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The Astradome Aven, Cueva Hoyuca
Northern Spain

This remarkable natural underground feature is almost perfectly circular and 100 metres tall. Deep underground in the 4 Valleys cave system, this is not an easy location to reach. The acoustics in the aven are amazing, with the sound from a single clap or shout echoing from the walls for many seconds before silence returns.

Copyright: Paul Fretwell
Type: Spherical
Resolution: 17044x8522
Taken: 20/03/2016
Uploaded: 20/03/2016
Updated: 06/01/2019


Tags: cave; cavern; underground; aven; caving; rope; climb; exploration; water; waterfall; natural
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