Germany has, despite that great big forest, and being the loser of two world wars, 236 people per square km.
Britain, which includes large northern areas of highlands where not many people live, has 275 people per square km.
Italy, which has mountains in the middle most of the way down, has 202 people per square km.
Yet France only has 119 people per square km. Why? I can't see obvious geographical factors, so it must be due to historical factors.
Guyana is not nearly enough to explain the difference. I am not sure on the reason, but France had a demographic slowdown in the 19th century, where parents were consciously not having too many children. My understanding is that farmers did not want their children's land to be too small, but I would love to hear what an actual historian can say on the subject.