Andean

This term is a proper adjective derived from the Andes, the longest continental mountain range in the world. It is used to describe both the physical geography and the biological diversity of the region, as well as the complex human civilizations that developed there, such as the Inca Empire.

Because it is derived from a proper noun, it must always be capitalized. It is typically used in academic, geographical, or anthropological contexts to specify a regional identity that spans multiple modern South American countries, including Peru, Chile, Ecuador, and Bolivia.