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I am also a H4a 1a1a, according to the ADN results processed in 23andme.
There is very little information on this haplogroup, maybe because it is very scattered around Europe, from what I am reading in this forum and in others. I will share with you my background, in case it is helpful for anybody:
Ethnically speaking I am Basque. I can trace my mithocondrial line back to around 1600s and all those women were Basques who lived in the Biscayan coast. The 23andme results concluded that I am 98% from the Iberian peninsula. I wonder what this means: my ancestors have always lived in the same place, that is, in the Northern area of the Iberian peninsula?
I read in your posts that people who also have this haplogroup come from Switzerland and from Sweden, which seem quite far away from the Basque Country. The more I read about this haplogroup, the more puzzled I get. If anyone can throw some light on this, we'll be so grateful!