Qullasuyu is also the region of the Qulla, named after a subgroup of the Aymara whose kingdom stretched from what is now northern Chile to central Bolivia before their territory was annexed by the Incas.
The Qullasuyu extended from Cusco to central Chile, where its advance southwards was halted after the Battle of the Maule when the Incas met determined resistance by Mapuche warriors, and the final border was fixed as being this area.
These side roads which linked the main highways followed an east to west orientation in line with the daily route of the sun, which the Incas worshiped as a god.
The royal Inca road entered Chile from Bolivia through what is now the international border crossing of Tambo Quemado (Quechua tampu inn,[5] Spanish quemado burnt, "burnt inn") on the Bolivian side and Chungara on the Chilean side, while a twin branch that runs parallel to it follows the coast from Peru and passes mostly through lower lying terrain.
It passed through fertile valleys with plenty of lakes and mineral reserves, favourable factors which made it the principal route used by the Incas to the southern extremes of the empire.