Da Lai tourism shrinks Thien Son Thinh An Gia in Cao Bang. Thien Son Thinh An Gia pine hill is an ideal destination for those who want to find a peaceful and romantic space. Coming here, you will see green fields, tall pine trees and white clouds flying across the blue sky. You will be immersed in beautiful nature, listen to the birds singing, the whispering wind and the gurgling water.