Lago Huillinco sits within the commune of Chonchi on the Isla de Chiloé, in Chile's Los Lagos Region. Together with Lago Cucao, it forms part of a protected nature sanctuary covering roughly 3,030 hectares of Valdivian temperate forest.

The two lakes are connected by the estrecho Contento and drain into the Pacific Ocean via the río Cucao, giving both bodies of water a notable marine influence and brackish character that supports a distinctive range of wildlife.

The lake serves as a quiet access point for outdoor activities including walking, birdwatching, and photography. A moderate hiking trail of approximately 5. 8 miles with around 1,600 feet of elevation gain traces the lake's surroundings.

The area is roughly 15 minutes from Chonchi and 35 minutes from Castro, making it a practical base for exploring western Chiloé.