Wetland in Ongjin Bay in South Hwanghae Province, a suitable place for Ramsar Site, has been protected and managed on a regular basis as Ongjin Migratory Bird (Wetland) Reserve and a habitat of "Ongjin Grus vipio", a natural living monument, and as a water collection area for salt field.

This wetland covering a vast area of tideland and salt and paddy fields is largely affected by tidal difference of the West Sea of Korea. Its southwest faces the sea and the other parts are surrounded by mountains with height of about 200 meters above the sea level. The wetland was formed by crustal movement.

DPRK experts estimate that this area, where more than 20,000 water birds have been observed every year, is up to the standard of the Ramsar Convention. Observed there until now are 14 species of water birds in danger of global extinction, eight species of water birds like black-faced spoonbill, hooded crane and Far-eastern curlew which account for more than 1 percent of their global or regional numbers, and animals and plants like sea-blite, community of Salicornia europaea, roedeer and weasel.

The area is also busy with the production of salt, paddy rice and seafood. As one of the country's major aquaculture bases, it has turned out much amount of laver, sea tangle, seaweed, etc. And it is abundant in marine resources like anchovy, gizzard shad, mullet and oyster.