The Río de Los Cipreses flows through one of the most dramatic and glaciated stretches of the central Chilean Andes, cutting through the Reserva Nacional Río de Los Cipreses in the Libertador General Bernardo O'Higgins Region. This tributary of the Cachapoal River drains a vast high-Andean watershed covering roughly 38,582 hectares, fed by snowmelt and glacial runoff from 42 glaciers encompassing more than 3,300 hectares of ice. The river runs through a landscape that transitions from Valdivian temperate forest at lower elevations — dominated by peumo, litre, and soapbark trees — to Southern Andean steppe at higher altitudes, creating a richly varied riparian corridor. The reserve was established in 1985 and is managed by the Corporación Nacional Forestal (CONAF), making it a protected natural area where fishing takes place within a conservation-focused framework.