Although in the past the Pyrenees were portrayed as a cultural border, separating South-Western Europe - the Iberian Peninsula - from France, it turns out that they have not played the role of a barrier to gene flow. People with autosomal genetic signatures more typical of the Iberian Peninsula than of Central and Northern parts of France, live on both sides of the mountains. Not only in the north-western part of the Pyrenees near the Atlantic Ocean's coast (where the Basque people live on both sides of the border), but also as we follow the course of the mountains in eastern direction, we will keep encountering genetically similar populations on both sides of the Pyreenes, all the way until we reach the coast of the Mediterranean Sea. It can be seen in the PCA graph attached below:
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