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The Dao ethnic group has a total population of nearly 1 million people. The Dao mainly reside in the mountainous Northern provinces such as Cao Bang, Ha Giang, Tuyen Quang, Lang Son which border with China. About their language, the Dao people speak the language of the Hmong-Dao language system. They have a written one based on Chinese characters but its pronunciation is different. It is called Nom – Dao language. In terms of their religion and beliefs, the Dao worship their ancestors and Ban House (Ban Ho). In some regions, the dead people from 12 years old and older are cremated. The Dao have strange customs. In marriage, a man has to stay in the wife’s family from 2 to 3 years ( or whole of their life).