The glacial lagoon of Sotillo Nature · Cobreros, Sanabria, Zamora Image of Cobreros, not of the place itself. Of glacial origin and about a hundred metres wide, it opens in the sierra above the village of Sotillo de Sanabria, near the waterfall of the same name, in a municipal district that ranges from 900 to 1,792 metres. Photo: Elperdiu (CC BY-SA 3.0 es) What to see and do in Cobreros