Also known as Dong ThaiTomb, is the tomb of King Tran Anh Tong, the fourth king of the Tran dynasty. In 1332, the Queen Thuan Thanh was also buried in Thai tomb.

Thai tomb is the first tombof the Tran built in Dong Trieu. The tomb was built on a low hill named Tan Quy hill, its three sides facing the North, the East and the West are surrounded by high mountain stretch. In front of the tomb, there is a stream flowing from the west, forming an open space with water gathering. In the 70s of the 20th century, the construction of Trai Loc Lake has changed the landscape of the tomb area, turning the Tan Quy hill an island, therefore Thai tomb area is also called by local people as the King Island.

 Thai tomb today lies in the middle of Trai Loc lake in An Sinh commune, about 3.5 km from An Sinh Temple. To visit Thai tomb, visitors will take a boat across Trai Loc lake, on the King Island to worship the places of worshiping King Tran Anh Tong and the Queen Thuan Thanh, enjoying the peaceful and picturesque landscape of Dong Trieu Town.