1617: cave
Riaño 30T 452758 4799361 (Datum: ETRS89. Accuracy code: G) Altitude 305m
Length 29m
Area position

Updated 21st October 2001; 2nd November 2002; 18th February 2012; 30th April 2016

   This resurgence is one of two situated in a eucalyptus wood with much undergrowth. The water flows down into a depression and cave-sink at site 1618. This cave is the southern-most resurgence. The cave appears on the Cueva Hoyuca and the Four Valleys System Hydrology diagram.

   A 1.5m high hole enters a small stream passage with roots which currently "ends" at a small chamber with cairn. Up to the left a crawl and short dig leads to a choke of calcited boulders which should dig. Straight ahead in the chamber, it is possible to lie flat out in water with a possible route up to the left that may link beyond the first dig. At Easter 2016, the digs were inspected and "could be worth the effort".

Reference: anon., 2001a (Easter logbook); anon., 2001c (Summer logbook); anon., 2002b (summer 2002 logbook); Corrin Juan, 2003a; Corrin Juan, 2003b; anon., 2016b (Easter logbook)
Entrance picture: yes
Underground picture(s): surveying   roots
Detailed survey: 1:500
Line survey:
On area survey:
Survex file: yes (Amended magnetic declination December 2013 to align with Eur79 grid and coordinates altered to fit ETRS89 datum, April 2014.)
Hydrology (Terry Whitaker): Hoyuca and the 4 Valleys System