[ClumsyPilot]

There aren't - look at slovakia, Czechia, Germany, France. In fact, where EU is one such area?

The other post here has done a total length of road network, which is actually a good metric.

[ajuc]

Mountains are one example. There are still people living there, but not nearly as much as in the densely populated parts. That's how it looks in Slovakia: https://govisity.com/wp-content/uploads/2018/04/Jahnaci_stit...

North of UK is almost empty. North-Eastern Germany has population density similar to USA which is pretty low compared to the rest of the country. France and Spain especially are sparsely populated outside of the big metro areas.