The Río Pichí Leufú is a spring-fed stream located about 60 minutes east of San Carlos de Bariloche in Río Negro, Argentina. True to its Mapuche name — meaning "small stream" — this is an intimate, clear-flowing river that winds through remote Patagonian countryside for nearly 85 miles before emptying into the Piedra del Águila Reservoir. Its spring-fed nature keeps flows relatively stable and the water clear, making it an exceptional destination for sight-fishing and technical presentations. The remote character of the river means you're more likely to encounter gauchos moving cattle or sheep through the landscape than other anglers, giving it a wild, unspoiled atmosphere that is increasingly rare in Patagonia.