Argentina operates 38 national parks, 11 natural monuments, 2 natural reserves, and 1 educational reserve under the administration of Parques Nacionales, the federal agency created in 1934. These protected areas span 4.5 million hectares across seven biogeographic zones, from subtropical rainforests at the Brazilian border to subantarctic forests 3,500 kilometers south in Tierra del Fuego. The national park system protects approximately 1.6 percent of Argentina's total land area, a figure below the global average for countries of comparable size, though provincial reserves add another 8 million hectares to the protected estate.
Iguazú National Park occupies 67,720 hectares in Misiones Province along the Iguazú River, which forms the border with Brazil. The park was established in 1934, the same year Brazil created its counterpart across the river. The Iguazú Falls complex comprises 275 individual waterfalls stretching 2.7 kilometers along the river gorge. The largest single drop, known as Garganta del Diablo (Devil's Throat), measures 82 meters high and 150 meters wide, discharging an average of 1,746 cubic meters of water per second. Flow rates vary seasonally from 500 cubic meters per second during dry periods to over 12,000 cubic meters per second during floods, as measured at the gauging station maintained by Argentina's Instituto Nacional del Agua. The park received UNESCO World Heritage designation in 1984 based on criterion vii (exceptional natural beauty) and criterion x (biological diversity). The subtropical rainforest within park boundaries contains 2,000 vascular plant species, 448 bird species including five species of toucan, and the largest remaining population of yacutinga, a critically endangered guan endemic to the Atlantic Forest.
Access to Iguazú National Park occurs through the town of Puerto Iguazú, 18 kilometers north of the park entrance. The visitor center at the park entrance recorded 1.6 million visitors in 2019, making Iguazú Argentina's most visited national park. Three marked trails provide access to different viewpoints: the Circuito Superior (upper circuit) runs 1.8 kilometers along the cliff tops above the falls, the Circuito Inferior (lower circuit) descends 1.4 kilometers to river level, and the Garganta del Diablo trail extends 1.1 kilometers on catwalks over the river to the main cataract. The park operates an ecological train on narrow-gauge track between the visitor center and the trailheads, reducing vehicle traffic on the access road. The train runs on propane fuel and carries approximately 3,000 passengers daily during peak season.
Los Glaciares National Park covers 726,927 hectares in Santa Cruz Province, making it Argentina's largest national park. The park extends along the eastern slope of the southern Patagonian ice field, which covers 16,800 square kilometers and represents the third-largest ice mass on Earth after Antarctica and Greenland. UNESCO designated the park a World Heritage site in 1981. The park contains 47 major glaciers fed by the ice field, with 13 glaciers calving into lakes accessible to visitors. Perito Moreno Glacier terminates in Lago Argentino at the park's southern sector, advancing across a channel called Brazo Rico at a rate of approximately 2 meters per day measured at the glacier's terminus. The glacier face rises 74 meters above lake level, with an additional 170 meters below the waterline as determined by sonar bathymetry conducted by the Argentine Antarctic Institute in 2016.
The Perito Moreno Glacier follows a cyclical rupture pattern documented since 1917. The glacier advances across the Brazo Rico channel until it contacts the opposite shore, forming an ice dam that blocks drainage from Brazo Rico and Brazo Sur. Water levels in the isolated arms rise 20 to 30 meters over a period of months or years while lake pressure increases against the ice dam. The dam eventually ruptures in a process that typically lasts 12 to 24 hours, draining the impounded water through a tunnel beneath the glacier or through the collapsing ice face. The most recent ruptures occurred in March 2016, March 2018, and January 2019. The 2018 rupture drew an estimated 40,000 spectators to the viewing platforms at Península de Magallanes, which provide observation points 400 meters from the glacier face. The glacier is named for Francisco Moreno, the Argentine explorer who surveyed the region between 1876 and 1877 and donated 7,500 hectares that formed the nucleus of Argentina's first national park.
The northern sector of Los Glaciares National Park contains the Fitz Roy massif, where Cerro Fitz Roy reaches 3,405 meters elevation. The peak was first climbed in 1952 by French alpinists Lionel Terray and Guido Magnone via the southeast ridge. The mountain's Tehuelche name is Chaltén, meaning "mountain that smokes," a reference to clouds that form around the summit when moisture-laden Pacific air rises over the Andes. The town of El Chaltén, established in 1985 at the northern park boundary, functions as the trailhead for approaches to Fitz Roy and the surrounding peaks. The town's population was recorded at 1,630 residents in the 2010 national census, though seasonal population reaches approximately 7,000 during the summer trekking season from November through March.
Nahuel Huapi National Park occupies 717,261 hectares in Río Negro and Neuquén provinces, established in 1934 as Argentina's first national park. The park centers on Lago Nahuel Huapi, a glacial lake covering 557 square kilometers with a maximum depth of 464 meters. The lake formed during Pleistocene glaciation and occupies a tectonic valley in the Andean piedmont. Seven major watersheds drain into the lake, which empties westward through the Limay River to the Atlantic Ocean after joining the Neuquén River to form the Río Negro. The park protects the transition zone between temperate Valdivian rainforest on western slopes receiving 3,000 millimeters annual precipitation and the Patagonian steppe to the east where precipitation drops below 400 millimeters. This gradient occurs over a horizontal distance of approximately 50 kilometers.
The city of San Carlos de Bariloche borders Nahuel Huapi National Park's eastern boundary, with urban development occupying former park land transferred to municipal jurisdiction through successive boundary adjustments. The city's metropolitan population reached 133,500 in the 2010 census. Tourism infrastructure developed rapidly after the railway from Viedma reached Bariloche in 1934, the same year the national park was created. The Llao Llao Hotel opened in 1938 on a peninsula 25 kilometers west of the city center, designed by architect Alejandro Bustillo in a style combining alpine and local timber construction. The hotel burned in 1939 and was rebuilt in 1940. The park contains 8 ski areas, with Cerro Catedral operating the largest lift infrastructure, serving terrain between 1,030 and 2,180 meters elevation across 600 hectares.
Tierra del Fuego National Park covers 63,000 hectares at the southern terminus of the Andes, 12 kilometers west of Ushuaia. The park was established in 1960 to protect subantarctic forest composed primarily of Nothofagus species including lenga, ñire, and Antarctic beech. The forest reaches the southern limit of tree growth on Earth at latitude 54°50'S within the park boundaries. The park extends from sea level on the Beagle Channel to 1,450 meters at Cerro Condor. Mean annual temperature at the coastal weather station measures 5.3°C with monthly averages ranging from 1.1°C in July to 9.4°C in January. Annual precipitation totals 524 millimeters distributed evenly across all months, with snow occurring during any month at elevations above 400 meters.
The southern sector of Tierra del Fuego National Park borders the Beagle Channel, where Bahía Lapataia marks the southern terminus of National Route 3, which extends 3,065 kilometers north to Buenos Aires. The coastline within park boundaries provided settlement sites for Yámana people, marine hunter-gatherers who occupied the channels of Tierra del Fuego for approximately 6,000 years before European contact. Approximately 400 shell middens have been documented within the park, containing remains of mussels, limpets, sea urchins, and marine mammals. The park service maintains marked trails totaling 40 kilometers, with the Senda Costera (coastal trail) following the shoreline for 8 kilometers between Bahía Ensenada and Bahía Lapataia. The park recorded 306,000 visitors in 2019, with 67 percent arriving between December and February.
Península Valdés received UNESCO Natural World Heritage designation in 1999 for its marine mammal populations. The peninsula extends into the Atlantic Ocean in Chubut Province, connected to the mainland by the Ameghino Isthmus, which narrows to 5 kilometers width. The Golfo Nuevo and Golfo San José flank the peninsula, creating protected breeding habitats for southern right whales, southern elephant seals, and southern sea lions. The provincial government administers Península Valdés through a system of provincial reserves rather than national park designation, with regulations prohibiting permanent human settlement except in the village of Puerto Pirámides, which had 565 residents in the 2010 census.
Southern right whales migrate to Península Valdés waters from June through December, with peak concentrations occurring from September through November. The Instituto de Conservación de Ballenas has conducted annual photo-identification surveys since 1971, documenting 3,700 individual whales through unique callosity patterns on their heads. The organization's 2019 survey recorded 764 whales in Golfo Nuevo and Golfo San José, including 214 mother-calf pairs. Female right whales reach sexual maturity at approximately 9 years of age and calve at intervals of 3 years on average. Newborn calves measure 5 to 6 meters in length and gain approximately 100 kilograms daily during the first months of life while feeding on milk containing 40 percent fat content.
The southern elephant seal colony at Punta Delgada on Península Valdés represents the species' northernmost continental breeding site. Adult males reach 4,000 kilograms and arrive at the beaches in August to establish territories before females come ashore in September. A single dominant male typically mates with 40 to 100 females in his harem during the six-week breeding season. The Wildlife Conservation Society's monitoring program recorded 41,000 elephant seals at Península Valdés beaches in 2018, with the population increasing at approximately 3 percent annually since systematic counts began in 1990. Elephant seals dive to depths exceeding 1,500 meters while foraging on squid and fish, remaining submerged for up to 120 minutes as measured by time-depth recorders attached to adult females.
Talampaya National Park protects 215,000 hectares of desert landscape in La Rioja Province, designated a national park in 1997 after functioning as a provincial reserve since 1975. UNESCO listed Talampaya together with Ischigualasto Provincial Park in adjacent San Juan Province as a World Heritage site in 2000 based on the Triassic period fossil record preserved in the sedimentary formations. The Talampaya Formation contains fossils dated to 250 to 200 million years ago, including remains of early dinosaurs such as Herrerasaurus and Pisanosaurus, two of the oldest dinosaur genera in the fossil record. The red sandstone cliffs forming Talampaya Canyon rise 143 meters above the canyon floor, carved by the Río Talampaya, which flows intermittently during the summer rainy season.
Access to Talampaya Canyon occurs only through guided tours operated by the park service, departing from the visitor center located 60 kilometers south of the town of Villa Unión. Visitors travel in park vehicles along a 14-kilometer route into the canyon, with stops at formations including La Puerta (The Door), where canyon walls narrow to 80 meters, and El Monje (The Monk), a freestanding pillar 120 meters high. The canyon walls contain petroglyphs created by indigenous inhabitants between 120 CE and 1180 CE, predating Inca expansion into the region. The park recorded 52,000 visitors in 2019. Summer temperatures in the canyon regularly exceed 45°C as measured at the weather station near the visitor center, with an absolute maximum of 48.9°C recorded in January 2003.
Los Alerces National Park covers 259,570 hectares in Chubut Province along the Chilean border, established in 1937 to protect Fitzroya cupressoides forests. These conifers, known locally as alerce, reach ages exceeding 2,600 years, making them the second-longest-lived tree species after bristlecone pine. The national park received UNESCO World Heritage designation in 2017. The park contains an estimated 25,000 hectares of alerce forest, representing 8 percent of the species' total range, which extends from approximately 39°S to 43°S latitude along both sides of the Andes. Individual trees reach 70 meters in height and 5 meters in diameter measured at breast height. A specimen called El Abuelo (The Grandfather) growing on an island in Lago Menéndez measures 2.2 meters in diameter and was core-dated to 2,620 years in age by dendrochronologist Antonio Lara of Universidad Austral de Chile in 1993.
The park includes six major lakes in a chain along the Río Futaleufú watershed, which drains westward to the Pacific Ocean through Chile. Lago Futalaufquen, the largest lake within park boundaries, covers 40 square kilometers. The village of Villa Futalaufquen at the lake's northern end provides lodging and park headquarters facilities. A boat service operates from Puerto Chucao across Lago Menéndez to reach the El Abuelo trail, the only authorized access to the ancient alerce grove. The park service limits visitors to this grove to 400 persons per day to minimize soil compaction and root damage. Los Alerces National Park recorded 76,000 visitors in 2019, approximately one-fifth the visitation of Nahuel Huapi National Park 200 kilometers north.
Lanín National Park encompasses 412,013 hectares in Neuquén Province, dominated by Volcán Lanín, which rises to 3,776 meters at the Chilean border. The volcano last erupted approximately 600 years ago based on carbon dating of ash layers. The symmetrical cone remains classified as potentially active by Argentina's Servicio Geológico Minero Argentino. The volcano's Mapuche name means "dead one" or "extinguished one" in reference to its inactive status during historical times. The park was established in 1937 and contains 24 lakes occupying glacially carved valleys in the volcanic piedmont. Lago Lácar and Lago Huechulafquen exceed 10 kilometers in length.
The park protects the northernmost extent of Araucaria araucana (monkey puzzle tree) in Argentina, a species that ranges along the Andes from approximately 37°S to 40°S latitude. Araucaria forests within the park grow between 900 and 1,800 meters elevation on volcanic soils. The trees are dioecious, with male and female cones on separate individuals. Female trees produce piñones, edible seeds that formed a staple food for Mapuche communities in the region. A mature tree produces 200 to 300 cones during masting years, which occur at 2 to 3 year intervals. Each cone contains 120 to 200 seeds. The national park prohibits collection of piñones except by Mapuche communities exercising traditional gathering rights within designated zones.
The village of San Martín de los Andes at Lanín National Park's eastern boundary has a permanent population of 32,000 residents according to the 2010 census. The town functions as the primary service center for park visitors and operates seven ski areas in the surrounding mountains, with Cerro Chapelco providing the largest facility. The park recorded 148,000 visitors in 2019. Provincial Route 234 crosses the park for 108 kilometers between San Martín de los Andes and Villa La Angostura, passing through araucaria forests and along the shores of four lakes. The route remains open year-round though winter snow above 1,000 meters elevation requires chains or four-wheel-drive vehicles from June through September.