Caño Negro Wildlife Refuge is a Wildlife refuge, part of the Arenal Huetar Norte Conservation Area, in the northern part of Costa Rica twenty kilometers south of Los Chiles near the border with Nicaragua in the Alajuela province. The refuge is a wetlands site that is home to many migratory waterfowl during part of the year, centered on Lake Caño Negro which is fed by the Frío River during the rainy season.