one of the characteristics of the dmz is that the wetland ecosystem is well formed. in the region there are a wide variety of wetlands ranging from valley wetlands in the eastern region to lowland wetlands in the western region. this is where many people lived and built rice fields in the past. these places have been left as wetland ecosystems for 60 years after the korean war. the wetland ecosystem of the dmz shows how past farmlands and lowlands developed into wetlands. the han river estuary where the cheorwon plain area, panmunjom area, imjin river and the han river meet with the west coast plays an important role as the final destination for the migratory birds. in cheorwon plain, more than 3,000 eagles come to spend winter each year.