The filling of the Fervenza reservoir Historical milestone · Mazaricos, Xallas, A Coruña Image of Mazaricos, not of the place itself. The closing of the dam on the Xallas flooded in 1966 valleys and farmland spread over thousands of plots in Mazaricos, Dumbría, Vimianzo and Zas, and forced a complete reordering of the farming life of the riverside villages. 1966 Photo: Fmrmayo (CC BY-SA 3.0) What to see and do in Mazaricos