The sulphurous spring of San Vicente Nature · Almeida de Sayago, Sayago, Zamora Image of Almeida de Sayago, not of the place itself. A spring of sulphurous waters known as the Hervidero de San Vicente rises in the municipal district, a landscape of granite boulder fields and dehesa of centuries-old holm oaks two kilometres from the Almendra reservoir. Photo: Manuel1985, on Flickr (CC BY-SA 2.0) What to see and do in Almeida de Sayago