Lago Posadas → Cochrane

Lago Posadas → Cochrane

Date: Thursday, April 1, 2027 · Distance: ~122 mi · Driving time: ~6h 15m (excluding stops) · Open in Google Maps

Road surfaces
Unpaved · 92 mi · 76%
Compacted gravel · 8 mi · 6%
Gravel · 8 mi · 6%
Dirt · 6 mi · 5%
Unknown · 5 mi · 4%
Concrete · 3 mi · 2%

The day begins in Argentina and ends in Chile, separated by one of Patagonia's quietest border crossings. Between the refugio on the shores of Lago Pueyrredón and the first proper town on the southern Carretera Austral, the road passes through landscapes that shift register entirely — from the turquoise basins and lenga forests of the Argentine steppe to the wind-scoured open country around the pass, and then into the greener, damper valley that receives you on the Chilean side. It is a day defined less by what you stop to see than by what surrounds you the whole way through.

The Drive

Leave the refugio at 9 am, heading first toward the Garganta del Río Oro — the Throat of the Gold River — a short detour into the Pueyrredón area before the day's main push begins. The Río Oro, fed by snowmelt from the flanks of Cerro San Lorenzo, drops through a narrow canyon here in a rapid-fire succession of rapids and cascades, lenga forest and soft grass giving way abruptly to a gorge of considerable depth and noise. The name carries traces of early European prospectors who worked this watershed at the turn of the twentieth century, drawn by the same remoteness that makes it feel so untouched today.

Back at Lago Posadas village, fuel up at the YPF before turning west onto Ruta Provincial 41 — the Monte Zeballos Road, one of the highest routes in all of Santa Cruz province. The road climbs from lake-level steppe through lenga woodland and into high mountain country, the kind of gravel track that repays a loose grip on the schedule. Condors ride the thermals along this corridor and guanacos appear with comfortable regularity in the open country. From here the route presses on to Paso Rodolfo Roballos, the border crossing that divides Argentine Santa Cruz from Chilean Aysén.

Crossing at Paso Rodolfo Roballos

Paso Rodolfo Roballos sits at 651 metres (2,135 ft) above sea level, a low but notably remote pass that handles a small fraction of the traffic that moves through the more travelled crossings to the north. The Argentine facilities — solar-powered, lightly staffed — process vehicles efficiently; the Chilean post, roughly 11 kilometres further west across no man's land, is equally unhurried. Budget thirty to forty minutes for the full crossing in each direction if everything goes smoothly, and confirm passport stamps before leaving — at this distance from anywhere, a missed entry is a complication worth avoiding.

One practical note for those leaving Chile via this crossing on a return journey: since 2023, travellers departing Chile at Paso Roballos are required to complete an online salvoconducto (police clearance) in advance, as there is no PDI immigration function at the post itself. Crossing from Argentina into Chile, as on this day, requires no such pre-registration.

The road on the Chilean side becomes the Ruta X-83. From here the drive follows the Río Chacabuco downstream through the Valle Chacabuco, the broad east-west corridor that forms the heart of Parque Nacional Patagonia. The valley has an origin story worth knowing. In 1994, Douglas and Kristine Tompkins were travelling the region when they camped on the banks of the Río Chacabuco and, according to Kristine, imagined that such an extraordinary place should be protected forever. A decade later their foundation acquired what had been one of the largest sheep and cattle ranches in Chile — the former Estancia Valle Chacabuco, established by British explorer Lucas Bridges in 1908 — and began one of the largest grassland restoration projects on record: removing 25,000 livestock, dismantling hundreds of kilometres of fencing, and reseeding native coirón grasses across soils that had been grazed to exhaustion. In 2018 the land was donated to the Chilean state and merged with the existing Jeinimeni and Tamango reserves to create Parque Nacional Patagonia. Guanacos are now a constant presence in the valley, and puma sightings are not unusual for patient observers. The road eventually meets the Carretera Austral (Ruta 7), and from there it is a short run north to Cochrane.

Arrival: Cochrane

Cochrane is the largest town on the Carretera Austral south of Coyhaique, and the southernmost settlement of any size along the highway — a practical fact that gives it an outsized importance for travellers moving in either direction. It was founded in 1954 under the name Pueblo Nuevo, with no paved road connection to the rest of Chile until 1988, when the Carretera Austral finally reached it. The town's current name honours Thomas Cochrane, 10th Earl of Dundonald — the British naval officer who served as the first admiral of the Chilean Navy and played a significant role in Chilean independence.

The town sits in a relatively sheltered valley on the edge of the Northern Patagonian Ice Field, which keeps its climate drier and milder than much of the surrounding region. The Río Baker — the largest river in Chile by volume, born where the glacial waters of Lago General Carrera meet Lago Bertrand to the north — passes close by, and the snowy mass of Cerro San Lorenzo (3,706 m / 12,159 ft), the highest peak in Santa Cruz province, is visible on clear days to the east.

The Plaza de Armas anchors a compact centre where most services fall within a few minutes' walk: supermarkets, restaurants, a laundry, and a tourist office with trail information for the nearby Reserva Nacional Tamango and the Parque Nacional Patagonia sector to the north. The reserve is one of the few places in Chile with a significant population of huemul, the endangered South Andean deer on Chile's national coat of arms. Campsites can be found in and immediately around town, some along the banks of the Río Cochrane, and at least one well-regarded pub serves craft beer — modest comforts, well earned after a long day on gravel.