As a wetland on the west coast of Korea, it was designated as a migratory bird reserve in Juche 84 (1995). It is located in Mundok County, South Phyongan Province.

Because of the heavy gulf between the low and high tides, the reserve is abundant in various feed favoured by waterbirds. So, it serves as an ideal place for the birds to recharge energy and take a rest on the way of their thousands-of-kilometre-long flight.