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How does the crest of the Pyrenees mark the border between France and Spain?
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Pyrenees
Aneto Peak in the Pyrenees.
The crest of the Pyrenees serves as the primary natural boundary between France and Spain. This high, 270-mile-long mountain chain acts as a formidable wall, with the international border generally following the ridgeline along the length of the range.1
There are, however, minor exceptions to this alignment where the territory of one nation extends across the crest into the other. Additionally, the small autonomous principality of Andorra is situated directly among the peaks of the range, interrupting the direct border between the two larger nations.1