Huilo-Huilo sprawls across the eastern slopes of Mocho-Choshuenco, a glacial compound stratovolcano whose flanks feed the reserve's many waterfalls. This is Valdivian temperate rainforest, one of the rare and ancient forest types on Earth, dense with ferns and southern beech. The reserve leans into the fairytale quality of the place. Beyond the Montaña Mágica there is the Nothofagus hotel built among the trees, cabins, and a backpackers' lodge, along with a brewery, animal habitats, a funicular, and miles of trails threading between the falls. It is unabashedly a for-profit operation, and it has used that wonder deliberately, turning a remote corner of the Andes into a destination people cross continents to reach.

What makes Huilo-Huilo more than a theme of green is what lives in it. Huemul, the endangered South Andean deer that appears on Chile's coat of arms, were reintroduced to the reserve in 2005 from the southern Aysén region, and guanaco have been brought back as well. Researchers monitor the puma that move through the forest and, more delicately, the population of Darwin's frog, the tiny Rhinoderma darwinii whose males famously carry their young inside their vocal sacs. The volcano above shapes this world too. Where the underground aquifer meets magma, explosive steam-driven eruptions have torn open craters, including one named the Tumba del Buey, the bull's tomb, on Mocho-Choshuenco's western flank.

This land was not always a refuge. Through the 1960s and 1970s the area around Neltume was timber country, home to a strong movement of lumberjacks and campesino workers tied to the great state forestry operations of the Panguipulli district. That history turned violent. In 1981, under the military dictatorship, a guerrilla detachment that MIR called Toqui Lautaro tried to establish itself in these forests to resist the regime. The Chilean army isolated the group by that August and captured its last members in October; several fighters were killed in combat or executed. It is a sober chapter beneath the reserve's enchantment, and worth remembering as you walk trails that once belonged to working people and an armed struggle.

The transformation from logging to tourism is largely the work of one man. Víctor Petermann, a Chilean businessman who came to acquire vast forestry holdings in the Los Ríos region, established the Huilo-Huilo reserve and steered the local economy away from felling trees and toward keeping them standing. His former wife, Ivonne Reifschneider, was part of the project as well. Whether you read it as conservation, enterprise, or both at once, the result is undeniable: a landscape that might have been cut over and emptied instead draws visitors who come to watch a waterfall fall from a hotel's peak, to glimpse a deer thought nearly lost, and to stand inside one of the oldest kinds of forest left on the planet.