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Why is Changde dialect the same as Shishou dialect?

Geographical reasons. Changde and Shishou are mainly located in Jianghan Plain, followed by Dongting Lake Plain. This is because geographical locations are constantly linked, and naturally they have the same language and customs as their neighbors. Changde, the city has two municipal districts and six counties, 1 county-level city, with a total area of 1.82 million square kilometers.