The people often called Inca were actually the Quechuan people. The Inca were their leaders. The local people are descendants of the ancient Quechuan people.
Due to lack of flat land in the mountains, the Quechua used terracing to farm. Our first archaeological site visit was to Pisac. An excellent example of terrace farming. The builders of the terraces used the natural landscape to their advantage to water their crops and control erosion.
Notice how the walls are inclined for strength. Mrs. Clark is standing next to a wall to show how it leans.