Into the Interior
South of Gobernador Costa, the route leaves the Ruta 40 and turns east onto the Ruta Nacional 26, angling across the central plateau toward Sarmiento and eventually the Atlantic. The steppe sheds whatever residual Andean character the landscape still carried. Coirones — the tufted needle-grasses characteristic of Patagonia — gradually give way to something harder and flatter, more arid in character, as the road angles away from the cordillera. The horizon becomes very wide. The wind, when it comes, comes without interruption.
This section of the drive, roughly 250 kilometres between Gobernador Costa and Sarmiento, is the quietest of the day. There are no towns of significance, few vehicles, and almost no trees. The reward is a quality of space that feels genuinely remote — not threatening, but absolute. The road crosses the upper reaches of the Senguer basin, the river system that drains the Andean snowmelt eastward across this plateau and terminates, hundreds of kilometres later, in the twin lakes at Sarmiento.
Sarmiento
The arrival in Sarmiento in the early afternoon — a stop of around half an hour — marks a change in register. The town of roughly 13,000 people sits in a valley between two large lakes: Lago Musters to the west and Lago Colhué Huapí to the east, both fed by the Senguer River from the Andean glaciers far upstream. Lago Musters was named by the naturalist Francisco Pascasio Moreno in 1876 in honour of George Chaworth Musters — the same English traveller whose memoir first recorded the name of Esquel — who had passed through the area in 1869. The Tehuelche had long called the lake Otrón.
Sarmiento itself began as a Welsh agricultural colony in the late nineteenth century, and some of that farming character endures: the valley is an unlikely pocket of fruit and vegetable production in an otherwise arid region, and the town has a reputation across Patagonia for the quality of its preserves, cheeses, and lamb. Trout and perch from Lago Musters appear on local menus. The town also has a significant paleontological and geological claim: 30 kilometres to the south, the Bosque Petrificado José Ormachea preserves a field of fossilised conifers and palm trees dating to the Paleocene, roughly 65 million years ago — laid down when this central plateau was a subtropical forest, long before the Andes rose and cut off the Pacific moisture. The petrified logs lie scattered across a moonlike desert terrain in conditions of remarkable preservation; a visit there is worth a separate excursion, but not today.
From Sarmiento, the route continues eastward on the Ruta Nacional 26 toward the Atlantic.
Arrival: Comodoro Rivadavia
The road descends from the plateau to the coast at Comodoro Rivadavia, arriving in the late afternoon. The approach from the west offers a first look at the San Jorge Gulf — a wide, grey-blue expanse of Atlantic — before the road drops into the city proper at the foot of Cerro Chenque, the distinctive hill that rises directly behind the downtown.
Comodoro is a petroleum city, and it makes no attempt to be anything else. It was founded on February 23, 1901 — by decree, not by organic settlement — as a port to handle the wool and agricultural output of Colonia Sarmiento to the west. The oil arrived by accident: in December 1907, workers drilling for fresh water hit hydrocarbons at around 540 metres depth. The discovery changed everything. The state oil company YPF was founded in 1922 with its operational headquarters here, and the city grew from a small port into the largest city in southern Patagonia, now home to some 200,000 people. Waves of immigrants — Italian, Spanish, Croatian, Welsh, Boer Afrikaner — arrived in successive generations to work the fields, and the city retains a layered immigrant identity beneath its industrial surface. It is still known as the Capital Nacional del Petróleo.
The Museo Nacional del Petróleo, 3 kilometres north of the centre in the General Mosconi neighbourhood, tells the story of that industry in some depth and is worth an hour if time permits. The cathedral on the main square is named — uniquely in the world — for San Juan Bosco, founder of the Salesian Order, which had a significant missionary presence in Patagonia.
The centre is functional rather than picturesque, but the setting — cliffs, gulf, wind — has a certain austere character. The beach suburb of Rada Tilly, 12 kilometres south along the coast, is the more pleasant place to walk in the evening.