With an odds shape connected with a legendary story, Nui Doi Quan Ba called Co Tien Moutain is regarded as an important destination in the tours to Dong Van rocky highland, an attractive place for professional photographers to come.

Standing alone in a small valley nearby Tam Son highland city of Quang Ba District, Ha Giang Province, surrounded with terraced rice fields and spotted with the houses made of soil in dark brown, typical for the scenery encountered in the rocky highland, Nui Doi looks so fascinating.

The best time to visit Nui Doi and contemplate these amazing sceneries of the site is the spring and the summer, when the grass and plants cover " the fairy`s breasts" in freshly green or rice fills out Tam Son terraced rice fields in brightly yellow.

Nui Doi is so beautiful and fascinating that local ethnic people have adored and preserved the legend of the fairy for many generations, it has become a part of their subconscious

As told by the legend, there was a young Hmong boy in Quang Ba, the misty highland, who had talent for performing musical sound by his lips; the sound was so melodious like stream flowing and bird singing, so tuneful like the wind spreading our everywhere to the sky that many young female highlanders were softhearted. A beautiful fairy from heaven named Hoa Dao occasionally encountered the music and looked for performer. They fell in love afterwards and she could not return to heaven. The marriage between the human and fairy was made finally. The couple had one son. The Lord knew Hoa Dao escaped from heaven and married with the human. He angrily recalled her back to heaven. Before leaving, she left her breasts to her husband to feed the baby with her breasts milk. The breasts gradually grew up and became the twin mountain like the mother `s breasts fully strain with milk. That twin mountain was named Nui Doi or Nui Co Tien

According to the legend, thanks to “the fairy`s breasts milk”, the weather at the site is cool and thus fruits grown there give wonderful taste, such as peach, apricot, persimmon.., rice and vegetable harvests are always successful. The fairy`s tear became the Mien River covering the rocky mountain area. 

Thanks to the fascinating beauty of Nui Doi and is value in terms of geology and natural scenery, the site was recognized the national famous landscape in 2010. In combination with the global geological park of Dong Van Rocky Highland, Nui Doi is the symbol, an atractive and important of this unique highland.