Kate Griffin's Urban Sorceror series is all about the magic of London, created from the collective life of the city, changing as the city changes. Her London has its own deities from the classic (the Fates live in the basement of the Transport Museum and have a cauldron full of PG Tips) to the quite unique (Fat Rat, the Lord of the rats of the London Underground). It's utterly location specific. Waterstones in Piccadilly has her books displayed under "London Fiction" as well as fantasy.
As for the rest, well, fantasy with a non-white cultural background written by a person of whatever ethnicity living in the West is still mostly informed by a Western cultural sensibility. I read some short stories by Aliette de Bodard (her Xuyan universe, very Orientalist) and found them utterly Western in outlook. Whereas Lukyanenko's Night Watch books (which I've only read in English) don't feel like that at all.
You have your own culture, you get to say what it's about. Don't worry too much about it. If US writers want to write nonsense about Celts, it's no skin off your nose, and if they're bored with it and want to write nonsense about Thailand like that cretin with the unpronounceable name, ditto. The SF/Fantasy world in English is (J K Rowling notwithstanding) essentially of marginal significance to reality.
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As for the rest, well, fantasy with a non-white cultural background written by a person of whatever ethnicity living in the West is still mostly informed by a Western cultural sensibility. I read some short stories by Aliette de Bodard (her Xuyan universe, very Orientalist) and found them utterly Western in outlook. Whereas Lukyanenko's Night Watch books (which I've only read in English) don't feel like that at all.
You have your own culture, you get to say what it's about. Don't worry too much about it. If US writers want to write nonsense about Celts, it's no skin off your nose, and if they're bored with it and want to write nonsense about Thailand like that cretin with the unpronounceable name, ditto. The SF/Fantasy world in English is (J K Rowling notwithstanding) essentially of marginal significance to reality.