There was already a map of R-L21 from the Busby et al. study, but I didn't like it. There was only one shade for all areas under 9%, and the frequency in Northwest France outside Brittany was excessive. So here is the Eupedia version, improved.
Note that I had to infer the percentage for Iceland based on Western Norway and increasing a bit the frequency since R1b is higher in Iceland than in Norway and it is highly probable that some Irish or Scottish people accompanied the Vikings to Iceland (this was already suggested by mtDNA studies).
Note that I had to infer the percentage for Iceland based on Western Norway and increasing a bit the frequency since R1b is higher in Iceland than in Norway and it is highly probable that some Irish or Scottish people accompanied the Vikings to Iceland (this was already suggested by mtDNA studies).