Introduction to Dagukou: Dagukou Fortress Heritage Park stretches from the main channel of the Haihe Fishing Lock to the main channel of the Haihe River in the east, to the main channel of the Haihe Estuary in the west, from the 200-meter Chui Di Middle Road on the west side of Binhai Avenue, and to Jingu in the south. To the east of the road is the southern edge of the grassland, to the north to the intersection of Binhai Avenue and the main channel of the Haihe Fishing Boat Lock, with a total area of ​​about 93.8 hectares.