Río Polcura is a stream flowing through the Biobío Region of Chile, a part of the country renowned for its cold, clear Andean and pre-Andean waterways that support healthy populations of trout. The river drains through a landscape typical of south-central Chile, characterized by volcanic geology, dense native forest, and the kind of pristine water quality that makes these rivers among the most productive trout fisheries in South America. As a tributary within the greater Biobío watershed, the Polcura shares the ecological character of the region — freestone flows fed by snowmelt and rainfall, with the dynamic water levels and seasonal rhythms that define Andean stream fishing.