From the air, the tidal creeks in the wetlands on the coast near Yancheng form intricate shapes resembling tree branches. Tidal creeks are narrow water channels in the mudflats from which water flows out at low tide. The tidal wetland on the coast off Yancheng is the largest of its kind in all of China. It stretches along 580 kilometers of coastline and provides ideal conditions for millions of water birds to migrate and breed.