Same in some parts of Germany. In the area where I grew up in you can tell in which village a person is from just by the way they talk, and the villages are jus

Same in some parts of Germany. In the area where I grew up in you can tell in which village a person is from just by the way they talk, and the villages are just ~3 km apart! From what I know this is because it was a relatively remote, dangerous and poor region (all by the standards of hundred years back) which changed ownership a lot (between clergy, bavaria, prussia) and people were mostly left to themselves