The more than 5200 km long street Ruta 40 strechtes from the very South of Patagonia to the Northwest corner of Argentina along the Andes. It is one of the most famous, legendary and scenic roads on earth. Few years ago travelers had to deal with difficult dirt and gravel parts including severe river crossing. Nowadays most of the street is tarred or pavement is in construction or planned.
But the most northern part is still as rough as in former times. In addition it passes its highest point, the dreaded Abra del Acay. With 4895 meters sea-level it is higher than the summit of Montblanc, the tallest peak of the Alps. South of this col are beautiful villages like Cachi, Payogasta and La Poma with some touristic infrastructure. North is the mining town San Antonio de los Cobres with its engineering masterpiece La Polvorilla, an impressive railway viaduct with about 50 meters high. The largest salt lake of Argentina Salinas Grandes follows. Finally the Ruta 40 merges with Ruta 9 to the border to Bolivia via the town Quiaca.