The Paso de Sico is a high mountain pass at an elevation of 4.092m (13,425ft) above the sea level, located in the Andes between Chile (II Región de Antofagasta) and Argentina (Provincia de Salta). The nearest towns to the pass are San Antonio de los Cobres in Argentina and San Pedro de Atacama, in Chile.
The pass is traversed by Chile Route 23, a dirt rubble road, and Argentina Route 51, connecting San Pedro de Atacama on the Chilean side with Catua and San Antonio de los Cobres on the Argentinian side.
Due to the unique location and the climb in elevation over thousands of feet, and passing through remote areas, it is important when driving in these conditions to be prepared. In summer, the extreme temperatures are 23 degrees Celsius, and -12 in winters, prevailing cold and dry weather.
The surface on this gravel road is often loose, especially along the sides of the road. It makes necessary to drive carefully and slow down whenever approaching an oncoming car.