This is what I found on my 23andMe results when I clicked on the Northern European title:

Northern Europeans are represented by people from as far west as Ireland, as far north as Norway, as far east as Finland, and as far south as France. These countries rim the North and Baltic Seas, and have been connected throughout much of history by those waters.
Population Source Sample Size
United Kingdom 23andMe 870
Germany 23andMe 367
Ireland 23andMe 292
Finland 23andMe 245
Norway 23andMe 220
Netherlands 23andMe 207
France 23andMe 200
Sweden 23andMe 170
Denmark 23andMe 125
Finland 1000 Genomes 93
United Kingdom 1000 Genomes 89
Switzerland 23andMe 87
Belgium 23andMe 80
Austria 23andMe 54
France HGDP 29

In looking back at MY results, my percentages for most of these countries is not even listed. I am guessing that the percentages are so low that they bunch those together into the Broadly Northern European countries classification.

Look under the Ancestry Tools section and try running "countries of ancestry" with all the options. You might be more interested in those results. I know I was.

I am Bobette Clarke-Tongay and my tree on ancestry.com is Clarke-Patt