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The Nahuel Huapi panorama
Overlook the deep lake carved by glaciers, its water an unbelievable blue, with the Llao Llao peninsula and Cerro Tronador drawing the classic Bariloche skyline across the water.
05 — Encyclopedia
Ice, wind &
a park's making
From the lake arms carved by glaciers, to the year-round Andean westerlies, to Mapuche reverence for these waters and the early-20th-century planners of the National Park — behind this terrace lie key natural and human memories of Patagonia.
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How glaciers carved Nahuel Huapi
Tens of thousands of years ago, Patagonia lay under a vast ice sheet. Glaciers sandpapered the valleys into U-shapes and cut the "brazos" — fjord-like arms reaching deep into the land. When the ice retreated, meltwater filled these basins and formed the deep Nahuel Huapi Lake.
Strictly, Nahuel Huapi was not built by a single river but by water pooling in glacially overdeepened basins, which is why it is extremely deep with a fractured, fjord-like shoreline.
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The Andean westerlies
In the southern mid-latitudes, the prevailing "westerlies" blow from west to east. When this moist air hits the Andes it is forced up, cools, and rains out — feeding the lush forest on the western slopes; descending the far side it creates the drier, brighter climate of Bariloche in the rain shadow.
The strong wind you feel on the terrace is part of the whole mountain's "breathing". Occasionally an easterly downslope wind (viento puelche) brings unusually dry, warm air — and a higher fire risk.
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The Mapuche and these waters
Long before the Spanish arrived, the Mapuche ("people of the land") lived for generations among these lakes and forests. In their worldview, lakes, mountains and springs were not resources but living presences to be revered and used with restraint.
"Nahuel Huapí" comes from Mapudungun, meaning "island of the jaguar". Today Mapuche communities remain vital cultural and ecological stewards of northern Patagonia, and many place names keep this linguistic memory alive.
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Ezequiel Bustillo & the Circuito Chico
In the early 20th century, Ezequiel Bustillo — a pioneer of Argentina's National Parks — led the park administration and pushed hard for conservation and tourism infrastructure around Nahuel Huapi. It was under his planning that a loop road linking the best viewpoints was opened: today's Circuito Chico.
Around the same time, architect Alejandro Bustillo designed the Llao Llao hotel on the peninsula's hillside, now one of Bariloche's most iconic buildings. The layout of the Circuito Chico itself is an early example of "managing scenery as public heritage".
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Cerro Tronador: Patagonia's living ice
Cerro Tronador (3,554 m), on the Argentina–Chile border, is among the highest snow peaks near Bariloche. Its name means "the Thunderer", from the cannon-like roar of ice tongues cracking and falling into the valley.
Several glaciers hang from its flanks (such as Castaño Overa) and are among the few living glaciers visible to the naked eye from the viewpoint. Under global warming these glaciers are clearly retreating, making them a vivid natural yardstick of climate change.
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Evergreen Coihue & myrtle Arrayán
The forest around the viewpoint is the "Andean-Patagonian forest". The evergreen southern beech Coihue (Nothofagus dombeyi) forms a dense canopy, while the deciduous Lenga, which turns flame-red in autumn, stars in Bariloche's fall colour.
Most special is the myrtle Arrayán (Luma apiculata): its trunk glows orange-red and it concentrates in the nearby Los Arrayanes National Park. These species are extremely sensitive to humidity and altitude, making them living indicators of the local microclimate.
