Location : Areas in Woljeong-ri and Daema-ri, Cheorwon Township, Cheorwon County, Gangwon-do Province.
		Characteristics : It consists of relatively flat plains and hilly terrain 200 to 300 meters above sea level. .....................................The flat riverside farmlands along many large and small rivulets, including Teokgok-cheon and .....................................Sangnyu-cheon streams originating from the gorge of Chuga-ryeong Pass, are blessed with .....................................abundant water resources. .....................................Cheontong-ri, Cheorwon County (also known as Saemtong) is designated as Natural Monument .....................................No. 245 for being a habitat of migratory birds.
		Size of the Area : 396, 696 square meters.

In the past, the hilly region of Jaesongpyeong (Naepo-ri), midway to Woljeong Station along Gyeongwonseon Railway Line leading north from Cheorwon Station in Oichon-ri, Cheorwon Township, Cheorwon County, was a basaltic lava land formed 270,000 year ago when a volcano exploded from 462-meter high Ori-san Mountain in Pyeonggang and lukewarm water (15 degrees Centigrade even in winter) gushes out and creates a swampland that never freezes over even in winter season. This ideal habitat with all the natural elements favorable to the visitation of wild fowl has a lake, and its surrounding area of 2-kilometer radius has been designated and preserved as Natural Monument No. 245 for migratory birds

since July 10, 1973. (ICBM) warns that, both in South and North Korea, seventeen species, including Chinese egret, stork, black-faced spoonbill, baikal teal, bear's pochard, Chinese merganser, Steller's sea eagle, hooded crane, red-crowned crane, white-naped crane, Swinhoe's yellow rail, spoon-billed sandpiper, Japanese murrelet, spotted sandpiper, Saunder's gull and fairy pitta, are in danger of extinction. Of these, four species such as hooded cranes, red-crowned cranes, white-naped cranes and Chinese mergansers are passage birds that visit the plains of Cheorwon north of Civilian Control Line. These plains in Cheorwon attract world-wide attention for the fact that winter birds such as white-fronted geese, bean geese, mallards and teals also arrive in a great mass and passing migratory birds mark this place as their midway milestone. The reason why these migratory birds come to this area of Cheorwon north of Civilian Control Line is that there are a vast marsh formed by non-freezing Saemtong, an artificial lake and an abundance of feeds. Saemtong is a kind of natural spring that came into being during the fourth period of volcanic activity. The fountain that gushes out in Naepo-ri, Cheorwon Twonship, forms a 6-kilometer long stream flowing down to Hantan-gang River in Yangji-ri and serves as an oasis on the frozen-over wilderness in wintertime. Today, the migratory birds that visit this place include cranes (designated as Natural Monument No. 202), hooded cranes (No. 228), white-naped cranes (No. 203), and summer birds such as Ardeidae and gray herons also come and stay here together with a lot of other birds, offering a favorite spot for tourists at all times. Here is also the Management Office for the commemoration of old battlefields at Cheor-ui-samgak (Triangular Zone of Iron), which makes it the best sightseeing resort combining both security tourism and ornithological exploration.