Tam Dao is a rocky mountain range in the Northeast region of Vietnam located in Vinh Phuc province. It is called Tam Dao because there are three high mountains rising above the sea of clouds: Thach Ban, Thien Thi and Mang Chi. The highest peak has an absolute height of 1.591 m. is a basin-shaped valley. There is a mountain here called Church, because close to the foot of this mountain there is an ancient stone church.