Introduction to the Longquan Mansion Site in Shangjing of the Bohai State: The Longquan Mansion Site in Shangjing of the Bohai State is located on the bank of the Mudanjiang River in the northeast of Jingbo Lake. It is the site of the Shangjing City of the Bohai State, a local government in the Tang Dynasty of my country. Its organization and scale are completely modeled after Chang'an City, the capital of the Tang Dynasty, and is divided into three parts: the inner city, the outer city and the palace city. There is also the famous Xinglong Temple in the capital. The Buddhist stone sculptures in the temple, including stone lanterns, banners and large stone Buddhas, are famous both at home and abroad. They have the artistic characteristics of the Tang Dynasty and the Bohai Kingdom and are rare treasures.