Río Quinchilca flows through the commune of Los Lagos in the Provincia de Valdivia, within Chile's Región de Los Ríos. This river holds a significant place in the regional fishing scene, particularly for fly anglers pursuing trout in a scenic southern Chilean setting. The Quinchilca is a tributary river that, upon its confluence with the Río San Pedro, gives rise to the Río Calle-Calle — placing it squarely within the broader Cuenca del Río Valdivia. The river has earned a reputation as a quality catch-and-release fishery, regularly hosting organized fly fishing competitions that draw participants from across Chile and even neighboring Argentina.