Río Biobío
Quilacoya River is located in the Hualqui commune of Concepcion Province of Chile. It has course of about 40 kilometers with a small volume. It originates in the southern slopes of the series of heights of Lucay that run from east to west in the southern part of the commune of Florida. It runs to the southwest to join the Bío Bío River on the North bank nine kilometers above the town of Hualqui.