Dai Kinh Thien is located in the west of Binh Tuong commune, Tay Son district in An Son spiritual tourist area, about 55km northwest of Quy Nhon, is a work showing respect and remembering the great merits of the insurgent army Tay Son initially raised the flag against the enemy inside and outside.

Legend has it that the sacred An Son mountain region is also the place where heaven and earth gave the sword orders and seals engraved with the word "Son Ha Xa Tac" for Tay Son Tam Kiet. Before starting the army to build a great cause to overthrow the two feudal groups Trinh - Nguyen, unify the mountains and rivers, wipe out foreign invaders, "guide the people to the great religion, bring the people to the long-spring realm", Tay Son Tam Kiet set up an altar to sacrifice to heaven and earth here to receive the seal of the sword and pray to heaven and earth to bless his career success.

According to Quach Tan in "The young country of Binh Dinh", Vietnamese and Chinese geographers both recognize Hoanh Son land as a great earth, because there are But (But Son - Hon Trung), Nghien (Hoi Son - Hon Dung). , An (An Son - Hon Giai), Sword (Sword Son - Hon Hoc Lanh), Co (Co Son - Hon Trong), Chung (Chung Son - Hon Chuong) on ​​the left and right.

Dai Kinh Thien was built on an area of ​​46 hectares in the An Son area located in the 364m high Hoanh Son mountain range in the north-south direction. Dai Kinh Thien is divided into 3 levels representing Heaven - Earth - Human and 4 entrance gates, in which the main gate facing the South has a horizontal painting inscribed "Bao Son Thien An" which means: This place is a precious mountain with the seal of God. The ceremony path includes 183 steps of the Zodiac to go to the altar.

Dai Kinh Thien has a profound human meaning, it shows the spirit of harmony with nature, with the wish that rain will be favorable and windy, the nation will be at peace, and the world will be at peace.