In England we have "the Black Country"[1][2] but it's not a country or a nation (or anything to do with race or skin colour) or even a clearly defined area, but a region of early industrial pollution and coal mining. We also have "the West Country"[3] which has its own sea borders, regional dialect, Cornish language, but isn't a nation or a country.

And we have "God's Own Country"[4] which is a phrase but does have an independence movement[5], and a region (Mercia) which hasn't been a place since 527-897CE but still has an independence movement[6].

[1] https://en.wikipedia.org/wiki/Black_Country

[2] https://bclm.com/

[3] https://en.wikipedia.org/wiki/West_Country

[4] https://en.wikipedia.org/wiki/God's_Own_Country#Yorkshire

[5] https://i-yorkshire.com/yorkshire-independence/

[6] https://independentmercia.org/declaration-of-independence/