Valle de la Mocha is a plain in Chile on the north shore of the Bio-Bio River that contained the reducción of Mapuche who were transported in 1685, from Mocha Island by Governor José de Garro; from which the valley and plain took its name. Governor Domingo Ortiz de Rosas transferred the old city of Concepcion to this site from Penco after the May 25, 1751 Concepción earthquake.