Flowing through one of the most spectacular valleys in Chilean Patagonia, the Río Simpson has earned its reputation as one of the finest fly-fishing rivers on the planet — officially ranked among the top four fly-fishing rivers in the world. Running parallel to the Coyhaique–Puerto Aysén road through the Reserva Nacional Río Simpson, this river cuts through a protected landscape of temperate lenga and coigüe forests, wetlands, and rugged Andean terrain in the Aysén del General Carlos Ibáñez del Campo Region. The reserve itself covers 40,827 hectares and was established in 1967, making it one of the oldest protected areas in the region. The river separates two sections of the reserve and is fed by the tributaries Cascada de La Virgen and Correntoso rivers, creating a rich and diverse aquatic ecosystem. The Simpson Valley is easily accessible via the Carretera Austral, yet retains a wild, remote character that draws serious anglers from across Chile and around the world.