Yên Châu is a district of Sơn La province in the Northwest region of Vietnam. As of 2019 the district had a population of 79,295. The distri…Yên Châu is a district of Sơn La province in the Northwest region of Vietnam. As of 2019 the district had a population of 79,295. The district covers an area of 844 km. The district capital is the eponymous Yên Châu.
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