Which countries are separated by the Pyrenees mountain range?

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Aneto Peak, Pyrenees — Pyrenees Aneto Peak in the Pyrenees.

The Pyrenees mountain range primarily serves as a natural boundary separating France and Spain.1

While the crest of the mountain chain generally marks the border between these two nations, the small, independent principality of Andorra is also situated within the peaks of the range.1