Full development of the Ulla river Historical milestone · Santiso, Terra de Melide, A Coruña Image of Santiso, not of the place itself. A ministerial order granted a hydroelectric company the use of the whole basin of the Ulla by means of eight reservoirs; of that plan only Portodemouros came to be built. 10 de noviembre de 1962 Photo: Elisardojm (CC BY-SA 4.0) What to see and do in Santiso