Origen de Alagón del Río como poblado de colonización Historical milestone · Alagón del Río, Valle del Alagón, Cáceres Founded as a colonization settlement (formerly 'Alagón del Caudillo') to resettle the population of Granadilla and Martinebrón, submerged beneath the waters of the Gabriel y Galán reservoir. It was administratively dependent on Galisteo from 1979; a 1995 referendum (90% turnout, 85% in favor) started its separation, and it became independent as Alagón del Río under Decree 158/2009 of the Junta de Extremadura, effective in November 2009. Photo: Hovallef (CC BY-SA 4.0) What to see and do in Alagón del Río