Estero Yali is a stream system located in the Santiago Metropolitan Region of Chile, draining a watershed of approximately 1,325 square kilometers within the broader Maipo River basin. The stream flows through the Yali Valley in central Chile, a region characterized by a Mediterranean climate with warm, dry summers and mild, wet winters typical of Chile's central zone. The watershed has been the subject of hydrological study dating back to the mid-20th century, when ground-water surveys were conducted in the Yali Valley to assess water resources for irrigation development. The stream ultimately drains toward the coastal zone near San Antonio, and its lower reaches are associated with the El Yali wetland complex — a significant ecological area that has drawn considerable attention for its biodiversity, particularly its waterbird populations.