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Dien Bien is a mountainous border province in the northwestern region, 500 km west of Hanoi; bounded by Lai Chau province to the north and Son La province to the east and north-east, Yunnan provinc...
Dien Bien is a mountainous border province in the northwestern region, 500 km west of Hanoi; bounded by Lai Chau province to the north and Son La province to the east and north-east, Yunnan provinc...