004 Cueva del Mar
Ogarrio VN537925 Alt. 110m Length 30m

Cave entrance in the north bank of the Asón is best approached by swimming across from south bank. Landing is on mud and a squeeze on the left enters a rift which leads to a second, higher entrance. The table in anon., 1993a has the cave at 60m long. The survey indicates more like 30m.
The cave has been pushed under the right hand wall since its exploration in the 70s. There is a sketch somewhere in one of the logbooks.
Water from the river Asón sinking in or near the cave resurges at Fuente Isena, 5km away near Ramales. During extreme droughts these sinks have taken all the river, so that the local people blocked them, after which the Fuente Isena dried up.

References: Corrin J S and Smith P, 1981; Mugnier C, 1969; anon., 1993a (survey)
Entrance picture :
Underground picture(s):
Detailed Survey :
Line Survey :
On area survey :
Survex file :