In the Netherlands there’s several ones I guess…

Limburgers (in the bit that sticks out down south) are usually seen as reserve-Belgians by the rest of the country. Tukkers are from the border region around Almelo, Hengelo and Enschede. Mostly known for their distinctive accent in which drawn out vowels are very recognisable. Otherwise you tend to get an East-West divide, basically resulting in Countryside vs Cityfolk.

Does that help?