Tucked within the dramatic Patagonian landscape of Río Negro, Argentina, the Río Quenquemtreu flows through one of the most storied fly fishing regions in the Southern Hemisphere. This river is accessed exclusively within the private grounds of Estancia Quemquemtreu, making it a prized and intimate fishery that sees limited pressure compared to more publicly accessible waters in the region. Its setting among the rolling estancia lands of northern Patagonia places it within reach of some of Argentina's finest trout waters, and the river itself serves as a gateway to the legendary lower stretches of the Río Collón Cura, one of the most productive trout rivers in all of Argentina.