First, the confusion worth clearing up. The park that draws the crowds, with its great wall of advancing ice, is the Perito Moreno Glacier - and that lies inside a different protected area, Los Glaciares National Park, well to the south. Perito Moreno National Park is its quiet, remote namesake, a separate place in the Andean highlands of western Santa Cruz Province, hard against the Chilean border. Both honor the same man: Francisco Moreno, the explorer, geographer, and naturalist nicknamed 'Perito,' meaning 'the expert,' who spent years mapping and studying Patagonia and is credited with founding Argentina's national park system. He donated land for the country's first park; this one, established in 1937, is among the oldest that followed.

The land here is built of mountains and valleys, and it performs a quiet geographic trick. Two ranges cross the park, one running east to west and the other north to south, and tucked among them lie eight lakes. The largest, Lago Burmeister, sends its water east toward the distant Atlantic. But others, like Lago Mogote and Lago Volcán, drain the opposite way, west toward the Pacific. Stand in the right valley and you are at a continental divide, where a single watershed splits the runoff between two oceans. The lowest valleys sit around 900 meters above the sea, blanketed in tall grasses and low forbs, while the high point, the peak of Cerro Heros, climbs to 2,770 meters. It is a landscape that feels enormous precisely because nothing human interrupts it.

Emptiness of people does not mean emptiness of life. The park shelters 24 mammal species, a handful of reptiles, and around 115 kinds of birds. Some, like the tuco-tuco - a burrowing rodent common across South America but little known elsewhere - go about their lives almost entirely unwatched. Two rare wildcats, the gato pajero and the endangered gato huiña, are found in this region and few others. Guanacos, so often mistaken for llamas, graze the steppe and make easy prey for the park's pumas, which also hunt the South Andean deer and smaller animals. Overhead, the Andean condor rides the mountain air - though local lore warns that many a triumphant 'condor sighting' turns out, on closer look, to be a falcon or an eagle.

Reaching this park is the hard part, and that is the whole point. No town sits anywhere near it. The closest Argentine road passes some 80 kilometers from the boundary; a Chilean road comes within about 10 kilometers and can make a better starting point. Many trekkers stage out of El Chaltén, finding a hostel and an experienced mountain guide before setting off, perhaps catching a rumored bus or hiring a ferry across one of the long lakes that reach into the park. Inside, only backcountry camping is allowed, and a local guide is strongly advised - there is no one to call if things go wrong. What you trade for all that effort is rare: a corner of Patagonia almost untouched by visitors, where the silence is real and the wilderness is yours alone.