What are the characteristics of the structure of Jindu Huining?

According to the excavation study, the city is rectangular, with a length of 2,300 meters from east to west and 3,300 meters from north to south. The northeast is close to the swamp, so it is recessed about 400 meters. The city walls are made of mud, and some walls about 5 meters high and 3 meters thick are still preserved. There is a door on each side of the city, not opposite, and there is an urn outside. The city is divided into north and south parts, with a partition wall in the middle and a door in the east of the wall. The terrain in the south is higher than that in the northwest. According to analysis, this is the seat of the palace. Now there are ruins of Miyagi, about 560 meters square. The main entrance of the palace area is in the south, opposite to the south gate of the city. There are high hills around the main entrance, which is a defensive building. There are corridors on the left and right sides of the main entrance (only ruins are left), and there are three buildings (base sites) in the middle.