Locate the andean countries of south america on this map. what economic challenge is unique to bolivia among the andean
countries?

The Andean countries of South America in the geopolitical sense are Colombia, Ecuador, Bolivia, and Peru.

Explanation:

Bolivia is unique among the Andean countries because it is landlocked. It has no access to either the Atlantic or the Pacific ocean. Bolivia lost its coast to Chile during the War of the Pacific in 1879–1884 and became a landlocked country. This is still an ongoing dispute, at least in the eyes of Bolivia.  The dispute with Chile was taken to the International Court of Justice as recently as 2018. The Court decided in favor of the Chileans. They declared that Chile was not obligated to negotiate a Bolivian corridor of access to the ocean, although it had held discussions regarding this with Bolivian representatives.

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