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Why are Hengnan dialect and Sichuan dialect so close? Is it close to other places in Hunan?

The tone is different.

But some words are similar to Sichuan dialect. Maybe you heard these words and felt very similar.

What really sounds like Sichuan dialect should be our Xiangxi side in Hunan, because it is close to Chongqing, Sichuan.

So Xiangxi dialect is closer to Sichuan dialect.