Final answer:
Ecuador, Peru, and Bolivia constitute the Andean West region in South America known for its high elevations, Amerindian population, and rich oil and mineral resources.
Explanation:
Ecuador, Peru, and Bolivia make up the region of the Andean West in South America. These countries have regions with high elevations in the Andes, including the Altiplano region with Lake Titicaca. The population in these areas is mostly Amerindian, and oil and mineral resources have been key sources of wealth.
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