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From San Miguel de Tucumán to the Valles Calchaquíes

Sosa Gorge and the Infiernillo Slope. Distance: 226 kilometres

A circuit to discover the fascinating western part of Tucuman. following the so-called route of a thousand curves. Starting at 400 MSL at the foot of the yungas, climbing up to 3000 MSL in the Infiernillo Slope. Nature, history, tradition, archaeology, myths and a scenic route that cuts across jungles and gorges. The starting point is San Miguel de Tucumán city and the destination point is the Valles Calchaquíes , a network of valleys and mountains with unique colours, shapes and topography.

Route Sheet

  • Distance: 226 kilometres
  • Road type: 80% asphalt. There are 49 km of gravel road between El Mollar, Quebrada del Portugués and Tafí del Valle, along Provincial Route 325. If you want to avoid this gravel road, you can drive from El Mollar to Tafí on Provincial Route 307. This same route, from Infiernillo to the junction with National Route 40, has stretches of asphalt in poor conditions.
  • Recommended months: all year round
  • Suggested duration: 4 to 6 days


KM 0

San Miguel de Tucumán

Capital City of the province of Tucumán with accommodation options and all services. It is the starting point of this circuit.

KM 70

Beginning of Scenic Route Quebrada de los Sosa (RP 307)

Going through sugarcane and blueberry fields, the route winds along rivers and yungas (the mountain jungle) and starts gaining altitude among ferns, grass and trees. Along the way, there are recreation areas, small oasis where you can enjoy the waterfalls and streams. The Monumento al Indio Viewpoint is located 1100 MSL, it is a 7-metre statue standing out in the landscape since 1942, which offers an ample view of the gorge and La Angostura River. This stretch is part of the Los Sosa Provincial Reserve and it is considered an IBA (Important Bird and Biodiversity Area) site.

KM 105

El Mollar

As you gain altitude, the yunga eases off and the tourist village called El Mollar emerges and welcomes you with its arid landscape. El Mollar is in front of the La Angostura dam, one of the few artificial lakes in the world, found at more than 2000 MSL. The dam is inside a provincial reserve that protects a great variety of aquatic and migratory birds, many of which are endangered species. You can practise watersports and enjoy fishing. If you are a hiking lover, you cannot miss the Ñuñorco Grande Mountain, one of the most appealing peaks in the Valles Calchaquíes. You can go trekking along high difficulty trails up to 3320 MSL (good health is required and hiring a guide is recommended). On clear days, you can enjoy the panoramic view of Tafí del Valle, the yungas and the snowy peaks of the Aconquija Mountain.

KM 108

Los Menhires Provincial Park

Among valleys and gorges, you will find this open-air archaeological museum, where you can see menhirs, huge upright stones carved by ancient populations that inhabited the valley over 2000 years ago. You will be amazed by their shapes: human faces, animals, geometric shapes and a combination of all these.

KM 123

Quebrada del Portugués

A rugged terrain with slopes and mountains that are almost vertical. The road winds through a landscape so green that will leave you speechless. Here, the streams and riverbeds shape beautiful waterfalls and cascades. It is located inside the Quebrada del Portugués Natural Reserve.

KM 135

Cóndores Viewpoint

From this viewpoint at 2400 MSL you can admire the Andean condors flying over Las Carreras Valley.

KM 137

Las Carreras and beginning of Los Alisos Waterfall

Las Carreras is one of the main attractions in Tafí del Valle. Located close to the Jesuit estate of the same name, it has a trekking trail bordering the Los Alisos River starting at 2100 MSL and reaching up to 3300 MSL. Amidst a dreamy landscape, there is an impressive 60-metre waterfall.

KM 151

Tafí del Valle

An ideal destination in the Valles Calchaquíes in Tucumán for adventure tourism lovers, where you can go trekking in the Muñoz, Los Cóndores and El Pelao Mountains, go horse riding or bicycle touring. Some of its must-see attractions include La Quebradita, a small hillock with a statue of Christ the Redeemer on the summit from where you can see the TafíTafí Valley, the Artisans Road and the natural culture of the province. You can also visit the Cumbres Calchaquíes Provincial Park, surrounded by mountains over 3000 metres high. In this area, there are fossil remains of mammals and a field of petrified carob trees, as well as some animals like partridges, flamingoes, Andean mountain cats and guanacos. This is the largest protected area in Tucumán, and it has been declared as an Argentine Natural Monument.

KM 173

Abra del Infiernillo

It is the highest mountain pass of Provincial Route 307, reaching over 3000 metres above sea level. Its beautiful landscapes charm anyone who see it: endless green fields, herder families with llamas and sheep, clouds that touch the ground, condors and black-chested buzzard-eagles overflying the sky, low grasslands dancing along with the wind and giant cacti witnessing the passage of time.

KM 193

Ampimpa Astronomical Observatory

The picturesque town of Ampimpa is the best place for astro tourism. Located at 2500 MSL, this observatory is known for its amazingly clear skies. There are astronomical observations, and accommodation may or may not be included. There are also trails to hike around the mountain range.

KM 205

Amaicha del Valle

This tourist village offers a unique landscape, a huge historical and archaeological heritage and one of the best microclimates in the world, with sunny days all year round. Nearby, you will find Los Zazos Dam and the Remante Waterfall. You can also visit the Pachamama Museum, which was built in 1996 by Héctor Cruz, a plastic artist from Salta. This museum displays the minerals that can be found in the region, pots and tools and mock-ups of ancient housings of the Tafí community, as well as tapestry, paintings and sculptures of ancient gods. A must-see attraction is the Tiu Punco desert, where you will be able to observe native fauna and remains of petrified forests. You can go hiking with certified tour operators.

KM 226

Quilmes Sacred City

Located at almost 2000 MSL, it is one of the most important pre-Hispanic settlements of the Calchaquí community. The Quilmes achieved great social and economic development, and by the 12th century, the city had over 3000 inhabitants. Walking between its pircas and sacred sites filled with giant cacti is a real trip back in time. From this point, you can continue travelling north to Cafayate and the Calchaquí Valleys in Salta.

Useful information

- If you are planning to travel by plane, the city of San Miguel de Tucumán has an airport. Another option may be to fly to the city of Salta and visit this circuit in the opposite direction, from the north, passing by Las Conchas Ravine and Cafayate.


- You can split your stay between El Mollar, Tafí del Valle and Amaicha del Valle to enjoy everything each of these destinations has to offer. In Tafí there are hotels, farms, cottages, inns, hostels and a municipal camping site. In El Mollar and Amaicha, there are fewer accommodation options.


- Remember to camp only in areas where camping is allowed. Put your trash in bags and take them with you. Only start campfires in areas where this is allowed, and put them out with plenty of water.


- If you want to do astro tourism in the Ampimpa Observatory, it is best to stay for at least one night. Check the weather forecast before booking your stay to make sure that you will get clear skies.


- If you are planning to visit during the Carnival Holiday (28 February, 1, 2 and 3 March) or on the Pachamama Day (1 August), early booking is recommended.


- It tends to rain a lot from December to March, and the trekking trails may get covered in mud.


- Provincial Route 307 is a mountain road with lots of curves and some stretches in poor condition. If you plan to cross Abra del Infiernillo, which is found at 3000 MSL, check the weather forecast to avoid rainy and foggy days. Drive carefully and avoid travelling at night. As there are grazing fields in the area, you may encounter animals on the road.