Lago Huillinco is one of the more significant lakes on the Isla Grande de Chiloé, located in the comuna of Chonchi, Provincia de Chiloé, within the Los Lagos Region of southern Chile. The lake sits on the western side of the archipelago and is hydrologically connected to Lago Cucao via the Río Desaguadero, forming a linked lacustrine system of considerable natural and cultural value. The name derives from Mapudungun and is interpreted as referring to the lake's characteristic greenish color.

The waters are described as calm, making the lake suitable for boat and kayak outings. Its position as a gateway toward Parque Nacional Chiloé adds practical significance for paddlers interested in exploring the broader western Chiloé landscape. Rural trails connect the lake area to both Lago Cucao and the national park, offering options for combined paddling and overland excursions.

Wildlife viewing is a notable draw on the water. Black-necked swans, herons, taguas (coots), and wild ducks are among the bird species reported in the area, making the lake of interest to paddlers who also watch wildlife. The surrounding landscape includes views toward the Cordillera de Piuchén.

The lake carries historical and cultural weight as well. It was historically used by Huilliche communities for navigation in traditional dalca canoes and as a resource base. The Cementerio de Huillinco, considered a heritage and cultural site, is located in the vicinity and represents a point of interest for those exploring the shoreline area.

The lake belongs to the hydrographic basin of Lago Cucao. Given its location in the rainy western sector of Chiloé, paddlers should plan for variable and frequently wet weather conditions typical of this part of Patagonia. No specific access points, launch facilities, or paddling restrictions have been established, so on-the-ground reconnaissance upon arrival is advisable.