From Marmot's Hole, The Herald and the Joongang.
Joongang: The areas where the search is focused on include air-defense entrenchments in Mount Umyeon, Gyeonggi and Gangwon, as well as some areas in Yangju, Gyeonggi. The border areas where North Korea’s wooden land mines are often discovered at a time of flooding were also included.
Note that Umyeon is in Seoul, just south of the Han. I lived near Sadang Station and learned the danso at the Korean Traditional Performing Arts Centre just below Umyeon mountain.
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ORIGINAL POST
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The Joongang reports that recent storms in North Korea have washed land mines -the exploding kind, if you really didn't know -into South Korea. It appears that two mines drifted in the ocean and landed on South Korean islands, but the one in Gangwondo was carried by a river.
I have heard that mines shifted by storms, floods and mudslides are a problem in South Korea, too. Without being able to recall the specifics, I do recall hearing that some mine fields in South Korea are impassible to South Koreans because the current locations of the mines is unknown.
Arirang is also reporting on the story.
Hmm. the Joongang seems to describe the Gangwon mine as being in a river:
One mine was found on Gyodong Island, one on Bolum Island in Incheon, and the other in Suip Creek in Yanggu District in Gangwon..
...but Arirang states that it was found at sea:
.
Two were discovered in waters off the west coast near Incheon and the other on the east coast off Gangwon Province.-----
I have discussed cross-border flooding before.