Trail running a Cabrales

I hiked the loop in the opposite direction, climbing Peña Castil from Terenosa and going down from Urelliu. The views are spectacular and the route is not too difficult or dangerous, even though the upper part is more serious mountain hiking than the "highway" back from Urelliu to Terenosa. There are some steep parts with loose rocks, but only very few are exposed and I used my hands only a few times. Can get harder if wet. Peña Castil does not add difficulties and is worth the detour. You won't meet lots of people up there, but there is emergency call coverage in most parts. Refugio Terenosa is a very cozy hut (only ~20 beds) and can be accessed within 45min of easy hiking from parkings at the end of the dirt road starting near Sotres.