Present the ceremony on September 16 were leaders of central and local agencies and a large number of local people.
Established hundreds of years ago, Hoang Su Phi district is now home to more than 60,000 people representing 17 ethnic minority groups.
They live mainly by growing rice and other subsidiary crops.
Terraced farming helps to ensure food security for the whole district, producing 25,000-27,000 tonnes of rice per year.
On this occasion, the authorities of Hoang Su Phi district organized a culture and sports festival for ethnic minority groups to introduce the special features of each ethnic minority group to visitors and tourists.