Working from memory but I do recall a small amount in Western Turkey. My guess is some of my Viking ancestors ventured that far but that’s about as much “ethnic” blood in my veins.
As for accuracy, I consider it a fun lark that’s great for party chitchat but that’s about it.
Harmless diversion from the real world angst.
If your ancestry is Viking, chances are that you will have lots of Central Asian Steppe ancestry along with aboriginal Western European hunter gatherers. If you have the raw data from one of those genealogy sites, you could have them analyzed for a more accurate breakdown.
Did the wifes dna and found out she had over 20% Arab from NW Algeria & Turkey,from muslim invasion into Hungary 500 years back; couldn't wait to inform her brothers.