Hi Paul.
Coventosa 450620 4789225
http://www.ramales.com/cueto/cueto.htm
see also
http://www.espeleogel.com/documentacion/cavidades/cantabria/valle%20del%20ason/coventosa/cueto-coventosa.htm
Sima del Cueto 449450 4789300
although its not what i remember when i flew in on google earth....it was in more of a grassy area....unsure of the accuracy
also
http://www.ramales.com/tonio/tonio.htm
for tonio - Cayuela
ps if you type " ramales cueto coventosa" into google it offers to translate the pages for you...might be a tad useful...eh Manwell.
Glad you're coming out to matienzo, easter