The thing is, this sort of thing can never be represented with borders. A more accurate map might be ones akin to wildlife population maps, with splodges dotte

The thing is, this sort of thing can never be represented with borders. A more accurate map might be ones akin to wildlife population maps, with splodges dotted around the country. Many accents exist in the same place and depend on a huge range of factors like class, immigration statistics, and geographic isolation.