The Salinas Grandes of Jujuy and Salta form the third largest salt flat in Argentina, after the Arizaro and Hombre Muerto salars. They spread across an endorheic basin — with no outlet to the sea — at 3,450 meters above sea level, straddling the border between both provinces. The depth of the salt layer varies between 1 and 40 meters depending on the sector, over a hardened crust that covers salt water below.
The salar formed approximately 10,000 years ago as a large Andean saline lake retreated. Today its surface displays the characteristic hexagonal evaporation pattern — cells 1 to 5 meters in diameter — that gives it that look of infinite white tiles so beloved by photographers.
Surface temperature can exceed 40°C at noon due to solar reflection, while air temperature rarely surpasses 20°C at that altitude. At 7 AM it can be below 0°C. The salt reflection and the absence of visual references create intense optical illusions: objects appear closer and a different size than they actually are. That effect is the basis of the perspective photos that have become iconic of this destination.
Beneath the Salinas lie significant lithium reserves that are a source of tension between indigenous communities, the provincial government and international mining companies.











