Qullasuyu ( and Quechua, qulla south, Qulla a people, suyu region, part of a territory, each of the four regions which formed the Inca Empire, "southern region", hispanicized spellings Collasuyu, Kholla Suyu) was the southeastern provincial region of the Inca Empire. Qullasuyu is the region of the Qulla and related specifically to the native Qulla Quechuas who primarily resided in areas such as Cochabamba and Potosí. Most Aymara territories which are now largely incorporated into the modern South American states of northern Chile, Argentina, Peru and Bolivia which was annexed during the reign of Sapa Inca Huayna Cápac in the sixteenth century.