This paper describes a 24 km subsection of the Inca Trail. Located in the eastern part of the Salar de Ascotán (salt flat) in the mountains along the Chile-Bolivia border, the route is quite straight and free of major obstacles, making it possible for a llama caravan to travel in a single day. This subsection has been subdivided into three segments of 578 m, 4,847 m and 18,613 m, according to their placement relative to the architectural facilities at Chac-Inga (UTM 589790N7590546E; 3731 m) and Tres Ojos de Agua de Ascotán (UTM578508N -7611392E; 4242 m), both of which appear to have been roadside tambos (inns) from the Tawantinsuyu period. Studies recorded the architectural features of the route, identifying its axis, the roadway, roadside architecture and the associated sites and elements. Landscape-geographic analysis focused on the visibility of the road and its interaction with the local and regional population. Researchers also examined the processes of continuity and change experienced by the road over time. Finally, this paper describes the Ruinas de una antigua posada (Ruins of an old roadside inn) site, possibly of Inca origin, and the Incan ceremonial structure at 5,200 m altitude on Cerro El Jardín or Ascotán.