Collasuyu was the Inca suyu southeast of Cusco that included the Lake Titicaca region.
Collasuyu, also spelled Qullasuyu or Kholla Suyu, was the southeastern quarter of Tawantinsuyu. It covered much of the southern Andes, including the high plateau around Lake Titicaca and territories that are now part of Peru, Bolivia, northern Chile, and northwestern Argentina. Its regional capital was Hatuncolla, near the northern part of the Titicaca basin.
Lake Titicaca held deep cultural importance in Andean traditions. In Inca origin narratives recorded by later writers, Manco Capac and Mama Ocllo emerged from the lake before traveling toward Cusco. The lake region was also politically significant because it linked highland communities, agricultural zones, and important routes across the Altiplano.
Collasuyu should not be confused with Kuntisuyu, the southwestern quarter, or Chinchaysuyu, the northwestern quarter. Antisuyu lay to the east. Modern sources often prefer the spelling Qullasuyu because it reflects Quechua and Aymara forms, but Collasuyu is a standard and defensible English-language variant.