[throwaway2037]

I am confused by this comment. Are you talking about Chaozhou (潮州)? That city is on the border between Guangdong and Fujian (but lies in GD), but the locals are overwelming Canto speakers. There are many who have migrated to Hongkong over the last 75 years.

[yorwba]

Isn't Chaozhou mostly Teochew-speaking? Wikipedia claims there are 10 million Teochew speakers in Chaozhou while listing the total population as 2.7 million, which obviously doesn't add up. https://en.wikipedia.org/wiki/Chaozhou#Language (My guess is metropolitan area vs. city boundaries.) But given that Teochew is named after Chaozhou (modulo romanization) I would've expected it to be locally dominant over Cantonese.

But what I was actually talking about were Huizhou, Heyuan, Meizhou etc. Basically, Cantonese extends as far east as Hong Kong and further east of that is marked as Hakka territory in the Language Atlas of China https://upload.wikimedia.org/wikipedia/commons/a/a9/Map_of_s... Meixian Hakka from Meizhou in particular has a prominent position within Hakka culture. https://en.wikipedia.org/wiki/Meixian_dialect