Río Llancahue is a river located in the Los Ríos region of southern Chile, flowing through a landscape characteristic of Chilean Patagonia — a land of dense native forests, volcanic geology, and pristine cold-water systems. The region sits within one of South America's most celebrated fly fishing destinations, where rivers run clear and cold through temperate rainforest terrain. The Los Ríos region is known for its relatively low fishing pressure compared to more heavily visited destinations, offering anglers a more intimate and wild experience on the water.