The Río Melado is a high-volume wilderness river located in the Linares province of the Maule Region in central Chile. It originates in the Cordillera de los Andes under the name Río Guaiquivilo, formed by two tributaries: the Río Cajón Troncoso, which rises near the Argentine border, and the Río Palaleo, which drains from Lago Dial approximately 70 kilometers upstream from their confluence. The Guaiquivilo flows northward through a classic interandean longitudinal valley before becoming the Melado. The Canal Melado, an infrastructure feature of the basin, diverts water from the river through the Guaiquivilo basin via a 4.2-kilometer tunnel to the Río Ancoa.

From a paddling standpoint, the Río Melado has long been on the radar of experienced whitewater paddlers as a serious wilderness objective. It is characterized as a high-volume run, and completing it from the source has historically proven extremely challenging — at least three unsuccessful attempts are documented. This context places it firmly in the category of committing, expedition-style whitewater rather than a casual day run. The remote and wilderness nature of the river means that self-sufficiency and careful planning are essential for any attempt.

The river also has a reputation among anglers, with trout fishing noted as an activity in the area, which reflects the relatively pristine character of the watershed. The surrounding terrain is mountainous Andean landscape consistent with the broader Maule Region. Given the remote location and the documented difficulty of accessing and completing the run, paddlers should approach the Río Melado with significant prior experience in wilderness whitewater environments and thorough logistical preparation.