Hua Phan and Son La have many natural, cultural, and social features in common, which explains the friendly relationship that exists between the people of these two provinces. Under the leadership of the Lao People's Revolutionary Party and the Communist Party of Vietnam, these bonds have been improved and developed day by day. The similarities in such natural features as location, mography, rivers, climate, biology, etc., have had a great impact on their relationship in terms of economy, culture, politics and security. Both Hua Phan and Son La take these characteristics into consideration in their cooperation, which has helped to promote the faithful relationship between two provinces as well as between Laos and Vietnam.