National Route 40 (Argentina)

At a length of 5,224 km, and stretching the whole mainland part of the country, the Ruta Nacional 40 is the longest national highway of Argentina and a popular travel itinerary. The southern end is at the South Atlantic coast and the road goes north following the Andes. The highway crosses remote and uninhabited parts of the country but also metropolitan areas like Mendoza and San Juan. The northern end is in La Quiaca at the border to Bolivia.

As the route goes through a variety of climatic zones and landscapes, driving its full length is still a bit of a challenge, even with a 4WD vehicle. Much of the road is still not paved; moreover, you may encounter paved sections that are under construction where vehicles need to drive on a temporary gravel track next to the road (such sections can be up to 20 km long).

Understand

Ruta 40 began as a connection between the few inhabited places in the strategically important border zone with Chile. Today it is a popular travel route and is marketed as such by the Argentinian tourism authorities. In practice, visitors only drive a part of the route; this is both due to the length of the highway and to the challenging conditions — one example of the latter is the Abra de Acay mountain pass where the road rises to 4,972 meters above sea level.

The route has been changed over the years. In the north there is still a debate which of the gravel roads should be named Ruta Nacional 40. In the south there is still a 100 km section between Cabo Vírgenes and Río Gallegos missing. Therefore the southern endpoint is given as Punta Loyola, a small port village near Río Gallegos.

Prepare

Plan at least two weeks for the journey, even more if you really want to enjoy the route. If you're in a hurry, the road can be driven in 8-10 days if there are no unforeseeable incidents. To get up to the Abra del Acay mountain pass, you would need an off-road vehicle, but luckily, there are alternative routes around this place where normal cars can be used. Despite the dry climate, there can be ice and snow blocking the road during the winter, and heavy rain can be a problem during the summer. Therefore, spring or fall are the best seasons for this journey.

Get in

There are multiple starting points, depending on where you wish to begin the journey. In addition to the places below, Mendoza is also a good option.

Punta Loyola is a small harbor on the Atlantic coast near Rio Gallegos. You can drive there from Buenos Aires along the fully paved but sometimes heavily trafficked Highway 3. The distance is 2587 km to Río Gallegos, plus 37 km to Punta Loyola.
La Quiaca can be reached from Buenos Aires by Highway 9 or Highway 34. Both highways have some four-lane sections, but most of them are busy two-lane highways. The distance is 1830 km. From Potosí in Bolivia you can get in along Highway 14 (paved).
San Carlos de Bariloche is the way in from southern Chile for driving a part of the road towards north or south. From Osorno, cross into Argentina through the Paso Internacional Cardenal Antonio Samoré.

Go

(Cabo Vírgenes)-Punta Loyola-Río Gallegos

Distance: 37 km (when the coastal road is finished, it will be 137 km)
Road surface: asphalt

There are plans to extend the road along the coast to the southernmost part of the Argentinian mainland at Cabo Vírgenes 📍, though as of early 2011 nothing had materialized yet. Hence, the official starting point of the highway is Punta Loyola 📍, a small harbor town with some industries and a Norwegian shipwreck.

The cape is still possible to visit along a gravel road going out from Highway 3. There the Magellan road begins, and at the cape itself is a lighthouse and a Chilean border station.

Following the bay, the road enters Río Gallegos 📍, one of the biggest cities in southern Argentina.

Río Gallegos-Charles Fuhr(-El Calafate)

Distance: 460 km
Road surface: gravel until 28 de Noviembre, then asphalt until Tapi Aike, gravel until RP 5, asphalt until Calafate.
Alternative routes: Ruta Provincial 5 Río Gallegos - El Calafate, entirely paved

Highway 40 overlaps Highway 3 for 35 km, then turns to the west and follows the Río Gallegos valley. The next built-up area is about 235 km away, from El Turbio 📍 onwards. This is Argentina's biggest coal industry plant, though the production has been cut down since the 1990s when it was hit by the economical crisis. After the town of 28 de Noviembre 📍, the road turns north and merges with highway 5 which it will overlap with until Charles Fuhr 📍.

Detour Torres del Paine

From Río Turbio you can take a detour into Puerto Natales 📍 and on to the world famous Torres del Paine National Park 📍 with its snow-covered summits.

Detour El Calafate and Los Glaciares

El Calafate 📍 is some 32 km west of the road, but the only major city in this region and as such the best alternative for finding a place to sleep. The city is a gateway to the Los Glaciares National Park 📍 with glaciers and forested mountain landscape. The road to the national park is completely paved.

Charles Fuhr-Perito Moreno

Distance: 656 km
Road surface: until Tres Lagos asphalt, then more than 70 km gravel (possibly paved), then asphalt
Alternative routes: Between Lago Cardiel and Riera there's a shortcut that used to form part of the Ruta 40 and is almost 50 km shorter than the current route. On the other hand, the current route through Gobernador Gregores is paved, but the shortcut isn't.

After Calafate the road follows the eastern bank of Lago Argentino, Argentina's second largest lake, and then passes Lago Viedma, the third largest. North of Lago Viedma there's a paved sideroad leading to El Chalten 📍. In the small town of Tres Lagos 📍 you should really fill up, because the road will enter a very remote and desolate section. The gas station is at the junction of RP 31, a bit outside of the town.

The road crosses the Patagonian meseta (plateau) made up of harsh steppe, some hills and some small green valleys. This is a bad place to get problems with your car on this lonesome section of the route. The only notable town is Gobernador Gregores 📍 with about 3,000 inhabitants and one gas station, though most people just drive past it. 150 km north there's a small roadhouse in the hamlet of Bajo Caracoles 📍 (100 inhabitants). Then follows Perito Moreno 📍, a town with 4,000 inhabitants and all services travelers will need, including places to eat and sleep, a bank, a supermarket and a gas station. If driving between Los Glaciares and San Carlos de Bariloche, Perito Moreno is about halfway, so this is a good place to stop for the night.

Detour Perito Moreno National Park

Perito Moreno National Park 📍 can be entered from Tamel Aike, 89 km off the highway. With rudimentary infrastructure this might be the lonesomest national park of Argentina, but this also means you get to enjoy untouched lake and forest landscapes at the foot of the Andes without hordes of tourists.

Detour Cueva de las Manos

From Bajo Caracoles you can get to Cueva de las Manos 📍, one of the most important archaeological sites of Patagonia. It's named after the famous hand paintings, though there are also other cave paintings. 44 km off the highway.

Perito Moreno-Esquel

Distance: 512 km
Road surface: asphalt
Alternative routes: old route 1S40 Río Mayo to José de San Martín, gravel, closer to the Andes

The landscape still stays desolate after Perito Moreno, but after Río Mayo 📍 110 km away the road is paved and some small towns follow: José de San Martín 📍, Gobernador Costa 📍 and Tecka 📍 (the latter has some natural attractions). Eventually you'll reach the city of Esquel 📍; with 40,000 inhabitants this is the biggest city since Río Gallegos. Esquel doesn't have many sights, but its very beautiful location among the Pre-Andes and range of available activities like hiking, mountainbiking and winter sports makes it a worthwhile place to stop.

Detours

For this section there's an alternative, more scenic route – the old highway which is nowadays named 1S40. It goes over Alto Río Senguer 📍, and the highlight is the mountain lake Lago Fontana.

From Esquel you can take a sidetrip to the Welsh town of Trevelin 📍.

Esquel-San Carlos de Bariloche

Distance: 283 km
Road surface: asphalt

The section between Esquel and Bariloche is probably the most touristy part of the southern Andes. The landscape comprises dense forests and many lakes. The only notable town here is El Bolsón 📍, a former hippie colony turned a popular destination for nature tourists. On the other hand San Carlos de Bariloche 📍 at Lago Nahuel Huapí has grown into a big touristy city, and is a stepping stone to the Nahuel Huapi National Park 📍, the most visited in the country.

San Carlos de Bariloche-Chos Malal

Distance: 585 km
Road surface: asphalt

Past Bariloche the road edges the lake Nahuel Huapi, after that follows San Martin de los Andes 📍, a picturesque town at the Lake Lácar. It's a popular destination thanks to its access to the Lanín National Park 📍. The next big town is Zapala 📍 (40,000 inhabitants), sitting among sandy hills. Around Chos Mahal 📍 the road comes closer to the Andes again. Aside of a few historical buildings, Chos Mahal isn't that a spectacular town but it is a good access point to the mountains.

Chos Malal-Malargüe

Distance: 334 km
Road surface: until the border with Mendoza asphalt, then traces of asphalt until Malargüe.

After Chos Malal there's again a more lonesome section and at some places the road is in a bad condition. The volcanic and steppe landscape sees relatively few tourists yet has some things worth seeing like the volcano Tromen 📍. The only inhabited places here are the two small towns of Ranquil 📍 and Barrancas 📍. Then follows the city of Malargüe 📍 with a good selection of lodging.

Malargüe-Mendoza

Distance: 350 km
Road surface: asphalt, from Ugarteche on four-lane expressway.
Alternative routes: a part of the section between El Sosneado and Pareditas along RN 144 and 143, asphalt.

More steppe follows, and just north of Malargüe you can take a sidetrip west to the huge sinkhole Pozo de las Ánimas 📍 with the nearby ski resort Las Leñas 📍. The road then enters the Río Atuel valley and leads to San Rafael 📍, the second biggest city in the Mendoza province. Ruta 40 circumvents the city entirely. There are two parallel roads in this area marked as Ruta 40 on the map, the old dirt road and a new paved road. The dirt track is farther to the east.

After San Rafael there are some typical Cuyo landscape, even steppes interspersed by green and populated oases. After Tunuyán 📍 comes Ugarteche 📍 and the roads turns into four-lane expressway, and this is a sign that you're about to arrive in Mendoza 📍. Mendoza is the center of the Argentinian viticulture, and with a million inhabitants the fourth biggest metropolitan area in the country. It's also a starting point for trips to some of the highest mountains in the Andes including Aconcagua 📍.

Mendoza-San Juan

Distance: 165 km
Road surface: asphalt. Until Las Heras four lanes, then two lanes until Va. Media Agua, followed by four-lane toad to San Juan.

This relatively short stretch between two major cities is in a good condition, but traffic is heavy. The only notable sight here is the sand desert 📍 near Lavalle, the only desert or that kind in South America. San Juan 📍 is a oasis city and center for agriculture.

San Juan-Chilecito

Distance: 409 km
Road surface: asphalt.
Alternative routes: RN 150/RP456/RP491 Niquivil - Huaco via San José de Jáchal, asphalt.

Exiting the oasis at San Juan, the road goes through a dry, hilly landscape. 130 km north of the provincial capital is the second biggest oasis in the Jáchal valley with the city of San José de Jáchal 📍. The highway circumvents this city of 20,000 inhabitants; if you wish to enter, take RN 150 and then RP 456 and RP 491 to get back to highway 40 at Huaco 📍.

Villa Unión 📍 in La Rioja province is the next notable town, and an access point to Talampaya. Then follows the Cuesta de Miranda, where the road goes next to a spectacular gorge. After some minor hamlets you arrive in Chilecito 📍, the biggest city on the northern end of the route and a bit of a tourist hotspot. There are several attractions in the surroundings: old villages, rock formations and one of the world's highest mountain railways which nevertheless has been shut down.

Detour Talampaya

Off the highway is the Talampaya National Park 📍 with interesting rock formations and palentological excavations. To get there, turn off at Villa Unión, drive about 70 km south along Highway 74 to Puerta de Talampaya. To explore the park in depth, you need to join a guided tour; in high season these tours often sell out.

Chilecito-Londres/Belén

Distance: 218 km
Road surface: asphalt.

North of Chilecito the road goes through the valley between Sierra de Velazco and Sierra de Famatina, some of the highest areas of the Andes with some mountains reaching up to 6,000 m above sea level. In the north of the La Rioja province, the valley turns into the highland of Campo de Belén. At the northern end of this highland is Londres 📍,the second oldest city of Argentina (after Santiago del Estero). This very calm and green city has two downtowns, but sadly there are few historical buildings left. A few kilometers further north is Belén 📍 with a better selection of lodging and a center of weaving.

Londres/Belén-Santa María del Yocavil

Distance: 172 km
Road surface: asphalt.

Next up: some exciting landscapes. Right after Belén the road goes through a gorge, and after that the valley widens once again. A place worth stopping is Hualfín 📍 a town surrounded by red rock walls. The highway goes 2,200 m above sea level, and descends into the Valle Calchaquí, one of the highlights of the journey. When you start seeing built-up areas, there are about 15 km left until Santa María del Yocavil 📍, the largest city in the valley. Santa María features a spectacular setting (if hardly any historical buildings), and there are many archaeological sites around the city.

Santa María del Yocavil-Cachi

Cachi-San Antonio de los Cobres

Distance: 145 km (over Abra del Acay), alternate route 100 km longer
Road surface: asphalt until La Poma, from there a challenging to overwhelmingly challenging gravel road
Alternatives: see below

After Cachi comes the hardest section of the route. Near La Poma 📍 it the road starts going uphill in the valley. After this the road gets considerably steeper. An offroad vehicle is recommended, and the road can get impassable both in summer (due to rain) and winter (due to ice and snow). The road serpentines uphill to Abra del Acay 📍, at 4,972 m above sea level the highest mountain pass in Argentina and one of the highest in the world (there are higher ones in Himalaya). From there, the road downhill gets better and leads to the mining town of San Antonio de los Cobres 📍. A rather poor city, it is the main settlement in western Salta.

Detour Salta / Alternatives to Abra del Acay

There are two ways to circumvent Abra del Acay. Both these routes are around 100 km longer than going over the mountain pass. They will lead through the provincial capital of Salta with half a million inhabitants and one of the best preserved colonial old towns in Argentina.

The first alternative goes from Cafayete along Highway 68 through Quebrada de Cafayate (see above). From El Carril 📍 or Salta 📍, to Highway 51 📍 that will take you San Antonio de los Cobres.

Alternatively, take RP 33 from Cachi, a route also known by the name Cuesta del Obispo 📍. This road passes an interesting gorge, and is passable without hassle at all times of the year. Also here, take the Highway 51 from El Carril or Salta.

San Antonio de los Cobres-La Quiaca

For the last stretch to La Quiaca, it has not been decided upon which of three possible routes should carry the label highway 40 so all three of them are described below:

Variant 1: Old route over Abra Pampa

Distance: 290 km
Road surface: gravel until Abra Pampa, then asphalt.

The original highway 40 📍 (carrying the name until 2005) goes north and is named Ruta 1V40, past the saline lake Laguna Guayatayoc 📍, crosses Puna and arrives in the town of Abra Pampa 📍 with 10,000 inhabitants. There it joins with Highway 9 which leads to La Quiaca 📍. This is the shortest of the three routes, but it is unlikely that it will be officially labeled Ruta 40 again.

Variant 2: Via Cobres

Distance: ca. 360 km
Road surface: gravel until Santa Catalina, then asphalt

This routing is favored by the province of Jujuy. The route as it's planned is still under construction, so you need to take alternative routes for a part of this routing. From San Antonio, first take Ruta 1V40 north like in variant 1 above, then Highway 52 📍 to Susques 📍. From there the road continues north passing Puna villages including the mining town of Mina Pirquitas 📍 which at 4,271 m above sea level is the highest in the country. The route almost reaches the Bolivian border, then turns east before arriving in La Quiaca. Before that you can take a sidetrip to Santa Catalina 📍, Argentina's northernmost town, with a colonial 17th century church.

Variant 3: Through Western Salta

Distance: 380 km
Road surface: bad gravel road until Susques, better gravel until Santa Catalina, then asphalt

This stretch is nowadays the "official" highway 40 and is favored by the province of Salta which sees it as a way of developing the west of the province. From San Antonio it overlaps with Highway 51 and goes towards Chile for 10 km or so, after which this Ruta 40 veers off north 📍 towards Susques and becomes poor enough that it's better driving by an offroad vehicle. In Susques it joins the route described as variant 2 above.

Stay safe

As already mentioned, some of the sections are better driven with a vehicle suitable for off-road driving or even driving as a group of multiple vehicles. Unlike for example remote parts of Brazil, highwaymen are unheard of here. Such asphalt pirates (piratas del asfalto) do exist on a smaller scale in Argentina, though they operate on busier roads and almost exclusively target trucks.

Fill up whenever you can, especially in Patagonia. Firstly, there's no guarantee that the next gas station has fuel available, moreover the mountainous terrain means higher fuel consumption than you might expect.

Go next

If you after the long journey have arrived at the Bolivian border and still are looking for more to see, take Bolivian Highway 14 to Potosí. From there you have all of Bolivia's attractions ahead of you, and you can continue onwards to other South American countries such as Brazil, Paraguay or Peru. To bring a car to Bolivia, a Carnet de Passages is required and you should obtain this document beforehand — obtaining it on the border is possible but the bureaucracy often takes several days.

In the southern end, you can continue to Tierra del Fuego with its temperate rainforests, lakes, landscapes and Ushuaia, the world's southernmost city. Also the south of Chile (which you need to pass through anyway) is worth a visit.

National Route 40 (Argentina) - highway in Argentina