Sangseung Observation Post and No. 1 Tunnel (상승OP, 제1땅굴)
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| registration date | 20091019234827 |
| Modified date | 20200527010446 |
| address | Baeknyeong-ri, Yeoncheon-gun, Gyeonggi-do |
| type | Culture/Art/History |
| area code | Gyeonggi-do |
| tel | +82-31-839-2063 |