Río Nantifal (locally known as Nant Y Fall) is a small, lake-fed stream tucked into the foothills of the Andes in Chubut, Argentina. Fed by a lake source, it carries the character of a spring creek — clear, cool, and demanding of careful presentation. The river sits within a stunning Patagonian landscape, offering anglers spectacular views of the Andes while surrounded by one of the region's richest waterfowl habitats. This is not a river for casual fishing; it rewards skilled, patient anglers who enjoy the challenge of stalking large trout on foot through wild, remote terrain.