AN-3
Main cavity of the Añelarra System, in the northwest area of the Sierra de Añelarra, with stepped verticals, water from 130 metres and an underground river of more than 10 kms.
EspeleoWorld
AN-3
Main cavity of the Añelarra System, in the northwest area of the Sierra de Añelarra, with stepped verticals, water from 130 metres and an underground river of more than 10 kms.
Isaba/Izaba
Sviluppo del sistema: 25800 m · Profondità del sistema: 739 m
Scheda aggiornata
https://espeleoworld.com/it/c/an-3-isaba-izaba
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Main cavity of the Añelarra System, in the northwest area of the Sierra de Añelarra, with stepped verticals, water from 130 metres and an underground river of more than 10 kms.
Descrizione
Morfologia
It begins in a joint with several stepped and narrow verticals.
Idrologia
The verticals lead to a section with water from 130 metres; at the end, a passage gives onto the underground river, whose galleries are travelled for more than 10 kms.
Progressione
From the entrance, the stepped and narrow verticals lead to a section with water from 130 metres and continue to -200 metres; a new vertical leads to -250 metres and a horizontal passage meets the great joint down to the bottom at -440 metres, with a passage to the underground river.
Storia
1975-78: Institución Príncipe de Viana, Estella - SC Frontenac & Departamento de Obras Públicas.
1990: G. E. Estella.
ARSIP (1997 SC Avalon).
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Fonte: Gobierno de Navarra – Catálogo espeleológico de Navarra (datosabiertos.navarra.es), modificato. CC BY 4.0, https://creativecommons.org/licenses/by/4.0/ Gobierno de Navarra · dati aggiornati a 2022