The least populated municipality in Sanabria Curiosity · Pías, Sanabria, Zamora With 91 inhabitants spread between Barjacoba, Villanueva de la Sierra and Pías itself, which keeps only eleven households, it is the least populated municipality in the comarca, at 1,063 metres of altitude and next to the Galician border. Photo: Estevoaei (CC BY-SA 4.0) What to see and do in Pías