Migratory birds fly over to Jeju when the time comes. They make their nests and fly away upon its completion.
The following are representative sites: the Gujwaub jongdal li coast near Sungsanilchulbong; Hadori fish farm; and the Yongsu reservoir. At the foot of Hadori Jimibong, a reservoir was made by building an estuary dike on the coast. There are plenty of places for migratory bird to have full feed and to make nests, making it a paradise for birds.