The Inca built a road system, the Qhapaq Ñan, that ran for tens of thousands of kilometres through six modern countries, from Colombia to Chile and Argentina, and parts of it climb into the driest desert in the world. This segment lies in the Atacama region of northern Chile, on high ground at the edge of the salt basins and volcanoes, somewhere in the great arid country east of Calama and San Pedro de Atacama. The roadbed there is a modest affair, a cleared path edged with stones, sometimes with small waystations, enclosures and cairns, and its purpose was to link the capital Cusco with the far southern edge of the empire and to carry runners, llama caravans and soldiers.
The region itself I can describe. This is a landscape of ochre plains, black lava, white salt crusts and cone volcanoes, at heights above three thousand metres, with a blue sky and a dry cold wind that can scour exposed skin. The air is thin, the nights are bitter, and the silence is complete. Guanacos and vicuñas graze in the tussock grass, and flamingos feed in the saline lagoons.
Riding here is high-desert adventure. Main roads such as the one from Calama to San Pedro are paved and good, but the tracks toward archaeological sites are gravel, sand and washboard, and side roads can be washed out after rare rains. Altitude affects both rider and engine, and fuel consumption rises, so plan more range than you think. Winter nights fall well below freezing, and there is a short summer rain season, called the Altiplanic winter, that can bring flooding.
No town is listed close to this point, so treat it as remote. San Pedro de Atacama has fuel, restaurants and lodging, and Calama is the larger city for repairs and supplies. Carry extra fuel, water, warm clothing and a tyre kit, and tell someone your route. Respect archaeological remains, never move stones, and keep to existing tracks, since the desert surface holds a scar for decades. Sun protection is vital at this altitude.