2974: Number 1 entrance (Hoyuca)
Riaño 30T 451679 4799778 (Datum: ETRS89. Accuracy code: G) Altitude 174m
Area position

Updated 1st July 2018

The original entrance to Cueva de La Hoyuca.

Reference: anon., 2008c (Easter logbook)
Entrance pictures:
Underground pictures :
Video :
Detailed Survey :
Line Survey :
On area survey :
Survex file :
Passage direction rose diagram: Four Valleys System

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