Andes Mountains: The Inca Empire stretched along the western coast of South America through what is now Peru, Bolivia, Ecuador, and Chile, mainly encompassing the Andes Mountains.
Quipu: The Inca used quipus, which were knotted strings, to keep records of various information such as taxes, census data, and historical events. It served as their system of writing.
Terrace Farming: Due to the mountainous terrain of the Andes, the Incas developed terrace farming techniques where they carved steps into slopes to create flat agricultural areas. This allowed them to cultivate crops in an otherwise challenging environment.