Turón River Nature · Mieres, Caudal, Asturias Despite more than a century of mining along its banks, this tributary of the Caudal still holds otter and Iberian desman, the second of these exclusive to this watercourse within the municipality, which marks it out as the river with the cleanest water in Mieres. Photo: Por los caminos de Málaga (CC BY 2.0) What to see and do in Mieres