Ocón Valley: This valley is located between the Ebro valley and the Hez valley. It is a UNESCO biosphere reserve. Its highest point above sea level is 1,338 metres. It is an interesting area historically, culturally and archeologically and is a popular area for rural tourism. Further reading (in Spanish): Five hiking trails through the Sierra de la Hez.
I was there yesterday. I’m sorry, my mobile’s pictures are not very good.