The big hole in the middle is Hungarians in Hungary and Southern Slovakia
The smaller hole a bit to the East are Hungarians in Romania, aka Szeklers
In the North Finns in Finland and Estonians in Estonia
Even Norther the Sámi people, they live in Finland, Norway and Sweden, but on this map they are part of the Finnish gap.
There are some Turkic language speakers as well, but they are so small, they are not visible on the map, e.g. Gagauz people in Southern Ukraine. And some part of Turkey is in geographical Europe.