Why is the Dzogchen area of Tibet considered to be sacred and unique?
According to history, highly accomplished practitioners such as Shri Singha, Padmasambhavaand Vimalamitra lived for many years in the Holy Dzogchen Area and hid many Dharma Treasures. Since then many practitioners in this holy place have attained Rainbow Body.
The Holy Dzogchen Area is renowned as a natural sacred land. It is where the Siltrom Snow Mountains and Rudam Canyon are located. It is a place of spontaneous blessings of the mandala of the Buddhas and Dakinis, and it is also the natural charnel ground of the Herukas.
see: Dzogchen area.