Typhoon Observatory (Hanja/Romanization: 颱風展望臺/Taepung Jeonmangdae) was established on 3 Dec. 1991 by the 28th Infantry Division Invincible Typhoon Force (Kor: 무적태풍부대/無敵颱風部隊/Mujeok-taepung Budae) of Korean Republic Army VI Corps (Codename: Advance/진군부대/Jin-gun budae). It is located at the top Suri Peak of Mount Bikki, Hoengsan-ri san 108-beonji, Jung-myeon, Yeoncheon County, Gyeonggi Province; which is located around 65km from Seoul and around 140km from Pyongyang. At first, it was built between Southern Limit Line and Northern Limit Line, 2km from the Military Demarcation Line. Now that North Korea put iron impalement around the truce line in 1968, South Korea set up iron impalement partially in 1978. Typhoon (Taepung) Observatory was established 800m from the truce line and 1,600m from a guard post of North Korea. Thus, it became the closest observatory on the truce line of 155 miles (244km).