Lago Futalaufquen is a stunning glacial lake nestled in the Andes Mountains within Los Alerces National Park in Chubut Province, Argentina. Its name derives from the Mapuche language, with "futa" meaning great and "laufquen" meaning lake — a fitting description for one of the park's largest and most impressive bodies of water. The lake is three-lobed in shape, occupying narrow valleys between glaciated peaks, and sits within the Futaleufú River system, which ultimately flows westward through Yelcho Lake and the Yelcho River into the Pacific Ocean in Chile. With a surface area of 44.6 square kilometers, a maximum length of 16 kilometers, and a maximum width of 2.5 kilometers, Futalaufquen is a substantial alpine lake of glacial origin. Its waters are exceptionally clear and deep, with an average depth of 101 meters (331 feet) and a maximum depth of 168 meters (551 feet), making it one of the deeper lakes in the Patagonian lake district. The lake's catchment area spans 2,920 square kilometers. A highway runs along the eastern arm of the lake, providing access to tourist facilities, the National Park headquarters, and the village of Futalaufquen. Fishing for trout is among the most popular activities on the lake, drawing anglers from across Argentina and around the world.