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| Lakes of Argentina | |
|---|---|
| Name | Lakes of Argentina |
| Caption | Lake Nahuel Huapi, Bariloche |
| Location | Argentina |
| Type | Various (glacial, volcanic, tectonic, endorheic) |
| Basin countries | Argentina, Chile |
| Notable | Lake Buenos Aires/General Carrera, Lake Argentino, Lake Viedma |
Lakes of Argentina are a diverse set of inland water bodies concentrated along the Patagonia, Andes, and the Pampas with key transboundary connections to Chile. These lakes include glacial basins such as Nahuel Huapi and General Carrera, tectonic reservoirs like Mar Chiquita (Córdoba), and saline endorheic systems such as Laguna Mar Chiquita. They shape regional landscapes from Santa Cruz Province to Neuquén Province and influence hydrology across basins like the Río Negro and Colorado River (Argentina).
Argentina's lakes are distributed across several physiographic provinces: the Andean Patagonia, the Pampa, the Sierras Pampeanas, and the Patagonian Plateau. Major basins include the western Basin of the Río Limay, the southern Santa Cruz Basin, and the central Dulce River basin. Cross-border basins with Chile host lakes such as Lake O'Higgins/San Martín Lake and Futaleufú Lake, while endorheic basins like Salar del Hombre Muerto and Laguna de Guayatayoc occur in the Puna de Atacama. Key urban proximities include San Carlos de Bariloche, Ushuaia, Comodoro Rivadavia, and Córdoba (city).
Many Argentine lakes are products of late Pleistocene and Holocene processes. Glacial lakes such as Lago Argentino and Lago Viedma occupy valleys carved by alpine glaciers related to the Andean orogeny and fed by icefields like the Southern Patagonian Ice Field. Tectonic basins include Mar Chiquita (Córdoba) and volcanic calderas like Lago Huechulafquen. Oxbow lakes occur along meandering stretches of the Paraná River, influenced by events such as the Great Paraná Floods. Saline and ephemeral lakes in the Puna—for example Laguna Santa Rosa—result from endorheic evaporation in arid climates typical of Provincia de Salta and Provincia de Jujuy.
- Andes/Patagonia: Lake Buenos Aires/General Carrera, Lago Argentino, Lago Viedma, Lago Nahuel Huapi, Lago Escondido (Tigre). - Northern and Central: Mar Chiquita (Córdoba), Embalse Río Tercero, Lago San Roque, Laguna Mar Chiquita (Santiago del Estero). - Puna and Altiplano: Laguna Brava, Laguna Pozuelos, Laguna de los Pozuelos, Laguna de los Ángeles. - Southern Tierra del Fuego: Fagnano Lake, Lake Escondido (Ushuaia), Yamana Lagoon. Each region interfaces with protected areas such as Los Glaciares National Park, Nahuel Huapi National Park, Iguazú National Park (for connectivity via river systems), and provincial reserves like Reserva Natural Otamendi.
Hydrologic regimes are controlled by precipitation patterns from the South Pacific High and orographic rainfall on the Andes, snowmelt from the Southern Patagonian Ice Field, and evaporation driven by the Patagonian Steppe. Major rivers—Río Santa Cruz, Río Limay, Río Neuquén, Río Negro (Argentina)—integrate lake inflows and outflows, while human infrastructure including Yacyretá Dam (on the Paraná River), Salto Grande, and reservoirs like El Chocón alter natural discharge. Groundwater interactions occur with aquifers such as the Puelche Aquifer in Buenos Aires Province affecting water tables near lakes like Laguna de Mar Chiquita.
Lakes host biota ranging from southern kelp-associated fauna near Ushuaia to high-Andean flamingo populations in Laguna Brava. Fish assemblages include native species such as Aplochiton taeniatus and invasive introductions like Oncorhynchus mykiss (rainbow trout) and Salmo trutta (brown trout), impacting trophic webs in Nahuel Huapi and Lago Argentino. Wetlands associated with lakes support waterfowl—Andean flamingo, Coscoroba swan—and mammals like hydrochoerus (capybara) in the Paraná Delta. Aquatic plant communities include beds of Potamogeton and reedbeds dominated by Typha domingensis in systems such as Laguna Mar Chiquita (Santiago del Estero).
Lakes underpin sectors in Argentina: freshwater supply for cities like Córdoba (city) and Bariloche, hydropower at El Chocón and Yacyretá, tourism in San Carlos de Bariloche and El Calafate, and fisheries around Lago Buenos Aires/General Carrera and Lago Argentino. Recreational industries include angling linked to Iguazú Falls-region tourism and sailing in Mar del Plata proximate lagoons. Agriculture and irrigation in provinces such as Mendoza Province and Río Negro Province depend on lake-fed reservoirs and channels like the Canal Cacique Guaymallén.
Challenges include glacial retreat of Perito Moreno Glacier-fed basins, eutrophication in reservoirs like Embalse Río Tercero, invasive species such as Egeria densa and introduced trout, water extraction pressures near Buenos Aires and Córdoba (city), and pollution from mining in regions around Catamarca Province and Jujuy Province. Conservation initiatives involve UNESCO designations for Los Glaciares, national park protections at Nahuel Huapi National Park and Tierra del Fuego National Park, basin management efforts like the Patagonian Hydrological Commission, and local community programs in Bariloche and El Calafate. Adaptive responses include transboundary agreements with Chile addressing General Carrera Lake/Lake Buenos Aires water allocations and scientific monitoring by institutions such as CONICET and universities in Córdoba (city) and Buenos Aires.