Nhoi mountain has been recognized as national monument and landscape by Ministry Of Culture, Sports and Tourism of Viet Nam. Nhoi mountain has 100 m of height and 4000 m of perimeter. From the far distance visitors can see it as symbol of giant lying elephant. Standing parallel with Long mountain, Nhoi and Long mountain form Crouching Elephant Hidden Tiger symbol that was considered as a lucky fang sui model in Eastern Philosophy. On top, it has a natural rocky pole that was approximately 20 m, and it looks like an upper part on man body. Behind that rocky pole there is another rocky shape that is looked like a woman is carrying a son, and facing to the East Sea. That rocky symbol is related to a Vietnamese folk story, it symbolizes for woman in the past who were waiting for their husbands to come back after war. It is quite similar to story of To Thi in another mountain of Lang Son Province