Title: Pre-Columbian era
Content:  Holding their capital at the great cougar-shaped city of Cuzco, Peru, the Inca civilization dominated the Andes region from 1438 to 1533. Known as Tawantinsuyu, or "the land of the four regions", in Quechua, the Inca civilization was highly distinct and developed. Inca rule extended to nearly a hundred linguistic or ethnic communities, some 9 to 14 million people connected by a 40,000 kilometer road system. Cities were built with precise stonework, constructed over many levels of mountain terrain. Terrace farming was a useful form of agriculture. There is evidence of excellent metalwork and even successful brain surgery in Inca civilization.
Title: South America
Content:  south central Ecuador), Chimú Empire (1300–1470, Peruvian northern coast), Chachapoyas, and the Aymaran kingdoms (1000–1450, Western Bolivia and southern Peru). Holding their capital at the great city of Cusco, the Inca civilization dominated the Andes region from 1438 to 1533. Known as Tawantin suyu, and "the land of the four regions," in Quechua, the Inca Empire was highly distinct and developed. Inca rule extended to nearly a hundred linguistic or ethnic communities, some nine to fourteen million people connected by a 25,000 kilometer road system. Cities were built with precise, unmatched stonework, constructed over many levels of mountain terrain. Terrace farming was a useful form of agriculture. The Mapuche in Central and Southern Chile resisted the European and Chilean settlers, waging the Arauco War for more than 300 years.
Title: Post-classical history
Content:  Inca Empire rose to annex all other nations in the area. Led by their, sun-god king, Sapa Inca, they slowly conquered what is now Peru, and built their society throughout the Andes cultural region. The Incas spoke the Quechua languages. The Incas used the advances created by earlier Andean societies. Incas have been known to have used abacuses to calculate mathematics. The Inca Empire is known for some of its magnificent structures, such as Machu Picchu in the Cusco region. The empire expanded quickly northwards to Ecuador, Southwards to central Chile. To the north of the Inca Empire remained the independent Tairona and Musica Confederation who practiced agriculture and gold metallurgy.
Title: Prehispanic history of Chile
Content:  of the Incas (growing plants on terraces on the sides of mountains with canal systems). By the 15th century, the Incas had taken possession of the territory of modern-day Chile up to the Maule River. At the south of the Aconcagua, the semi-nomadic communities such as the Mapuche were set up. In the austral zone of the country, various Amerindian people such as the Chomos, Tamanas, Alacalufes and Onas were living. In the Easter Islands a Polynesian culture developed, which continues today. On the Pacific coast, different cultures and peoples coexisted: the Aymara, Chango, Chinchorro, Atacama, Diaguita in the north: the Picunche, Mapuche, Huilliche, Chono in the Central and Southern region; and the Ona, Yaghan and Alakaluf in Patagonia and Tierra del Fuego. The Mapuche formed a numerous community.
Title: The Chilean Inca Trail
Content:  From the mid to late 15th century, the Incas established forts in northern and central Chile, from the far north to near where the city of Rancagua stands today. Under the helm of the Incas, these parts of Chile were in the Qullasuyu (Quechua for southern region), the south-eastern province of the Inca Empire. 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 
Title: Incas in Central Chile
Content:  Inca rule in Chile was brief; it lasted from the 1470s to the 1530s when the Inca Empire was absorbed by Spain. The main settlements of the Inca Empire in Chile lay along the Aconcagua, Mapocho and Maipo rivers. Quillota in Aconcagua Valley was likely the Incas' foremost settlement. The bulk of the people conquered by the Incas in Central Chile were Diaguitas and part of the Promaucae (also called Picunches).
Title: History of Peru
Content:  The Incas built the largest and most advanced empire and dynasty of pre-Columbian America. The Tahuantinsuyo—which is derived from Quechua for "The Four United Regions"—reached its greatest extension at the beginning of the 16th century. It dominated a territory that included (from north to south) the southwest part of Ecuador, part of Colombia, the main territory of Peru, the northern part of Chile, and the northwest part of Argentina; and from east to west, from the southwest part of Bolivia to the Amazonian forests. The empire originated from a tribe based in Cusco, which became the capital. Pachacutec wasn't the first Inca, 
Title: Prehistoric art
Content:  This time period represents the era in which the culture of the central Andes is almost completely dominated by the Inca Empire, which began its expansion in 1438. It lasted until the Spanish conquest in 1533. The Inca absorbed much technical skill from the cultures they conquered, and disseminated it, along with standard shapes and patterns, throughout their area of influence, which extended from Quito, Ecuador to Santiago, Chile. Inca stonework is notably proficient; giant stones are set so tightly without mortar that a knife blade will not fit in the gap. Many of the Inca's monumental structures deliberately echoed the natural environment around them; this is particularly evident in some of the structures at Machu Picchu. The Inca laid the city of Cusco in the 
Title: History of the Incas
Content:   The Incas were most notable for establishing the Inca Empire in Pre-Columbian America, which was centered in what is now Peru from 1438 to 1533, and represented the height of the civilization. The Inca state was known as the Kingdom of Cuzco before 1438. Over the course of the Inca Empire, the Inca used conquest and peaceful assimilation to incorporate the territory of modern-day Peru, followed by a large portion of western South America, into their empire, centered on the Andean mountain range. However, shortly after the Inca Civil War, the last Sapa Inca (emperor) of the Inca Empire was captured and killed on the orders of the conquistador 
Title: Mitma
Content:  administration, the coast and western slope between Peru and Chile were considered a distinct administrative region populated by enclaves of atiplano colonists. In addition to the Titicaca Basin, the Inca forces went north and stormed Cajamarca, capturing it and leaving a small garrison there. The Inca then returned to Cajamarca later in order to reinforce the isolated garrison at Cajamarca. Before returning to the capital, the Inca extended imperial control northward into the Ecuadorian highlands. The Inca forces then pushed the southern frontier of the empire into Northwest Argentina and Central Chile. Population swaps were also used in the territory of present-day Ecuador and had a large impact in the population mix of the region. In the area of Tumipamba, the transition was almost complete.

Question: what region did the incas live in?
Answer: Cusco.