I just got the A320 and decided to take it for a spin at EGMC (London Southend) when I saw a load of planes on the map, far off to the East. I believe that this is the Amsterdam region, which is very close to London. The Amsterdam region had a lot of ATC at the time so that’s why the number of airplanes are high.
The map is a world map, but if you fly over there you will only see other planes, no region textures or airports. And ATC will probably ghost you on the advanced server.
Well, just a little bit of Paris is kinda connected. There is one airport in France in the Amsterdam region. But in that regions there’s also Germany, Belgium, The Netherlands and Denmark (I think it’s Denmark)