Río Los Sauces flows through the Ñuble Region of Chile as a tributary of the Ñuble River, which itself is one of the primary affluents of the larger Itata River system. Nestled within a basin of remarkable ecological richness, this river winds through a landscape shaped by the Andean foothills and the agricultural heartland of central Chile, where cereals, vineyards, and fruit crops define the surrounding terrain. The Ñuble River system, into which Los Sauces feeds, drains a watershed that supports an impressive array of native biodiversity, making this a river of both ecological and angling significance in the Ñuble Region.