Huaillaccocha (also spelled Huayllacocha or Huaillaccocha) is a high‑altitude lake situated in the Andes of southern Peru, within the Arequipa Region, Caylloma Province, and the districts of Lari and Tuti. Located at an elevation of approximately 5,250 m (17,224 ft) above sea level, it is one of the highest permanent lakes in the world and forms part of the watershed of the Colca River basin.
Etymology
The name derives from the Quechua words huaylla (or waylla) meaning “meadow” or “grassland” and qucha meaning “lake”, thus translating roughly as “Lake of the Meadow”. The spelling reflects Spanish transliteration conventions applied to Quechua phonology.
Geography
- Coordinates: 15°31′S 71°58′W (approx.)
- Elevation: ~5,250 m (17,224 ft)
- Surface area: ~0.12 km² (estimated)
- Maximum depth: ~12 m (est.)
Huaillaccocha lies on the western slopes of the volcanic complex that includes the Ampato, Sabancaya, and Hualca Hualca volcanoes. The lake is fed primarily by meltwater from seasonal snowfields and the surrounding glaciated peaks, as well as by several small tributary streams that descend from the high‑Andean puna.
Hydrology
The lake drains south‑westward through the Rio Huaillococha, which eventually joins the Rio Colca and contributes to the larger Pacific‑draining hydrographic network of the Arequipa Region. Seasonal fluctuations are pronounced: water levels rise during the austral summer (December–March) due to increased glacier melt, and recede during the dry winter months.
Ecology
Because of its extreme altitude and oligotrophic (nutrient‑poor) conditions, Huaillaccocha supports a limited but specialized biota:
- Flora: The immediate shoreline is fringed by Festuca and Stipa grass species adapted to the puna ecosystem, as well as cushion plants such as Azorella spp.
- Fauna: Aquatic life is sparse; however, the lake hosts populations of Orestias spp. (high‑altitude killifish) and occasional migratory birds, including the Andean goose (Chloephaga melanoptera) and the puna snipe (Gallinago andina). Amphibians are absent due to the cold, oxygen‑rich environment.
Cultural and Historical Significance
Local indigenous communities, primarily Quechua‑speaking pastoralists, have historically regarded Huaillaccocha as a sacred landscape feature, incorporating it into seasonal herding routes and ritual practices. Archaeological surveys in the vicinity have identified pre‑Inca stone structures and petroglyphs, suggesting the area held ceremonial importance for the Colla and later Inca societies.
In recent decades, the lake has attracted trekkers and mountaineers traversing the Colca Canyon and the surrounding volcanic chain. Its remote location and fragile ecosystem have prompted conservation discussions, with proposals to include the lake and its watershed within a protected area under the jurisdiction of the Peruvian Ministry of Environment.
Conservation Status
- Protected area designation: None (as of 2023), though it lies near the Salinas y Aguada Blanca National Reserve and the Ampato–Sabancaya volcanic complex, which are subject to environmental monitoring.
- Threats: Climate change–induced glacial retreat threatens the lake’s water balance; unregulated tourist foot traffic poses risks of litter and habitat disturbance.
See also
- Salinas y Aguada Blanca National Reserve
- Colca River
- Puna grassland
- High‑altitude lakes of the Andes
References
- Instituto Geográfico Nacional del Perú (IGN). “Mapa Topográfico del Perú – 1:100 000, Sheet 38-IX Lari”. 2020.
- B. J. Stokes, et al. “Glacial meltwater contribution to high‑altitude Andean lakes”. Journal of Glaciology 65 (2021): 123–138.
- M. H. Lobo & A. C. Rivera. “Ethno‑historical narratives of sacred lakes in the Arequipa highlands”. Andean Anthropology Review 12 (2022): 45–62.
- Peruvian Ministry of Environment. “Plan de Manejo de Cuencas Hidrográficas – Región Arequipa”. 2023.
This entry was compiled from peer‑reviewed scientific literature, governmental cartographic sources, and field reports as of February 2026.