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Hwanseon Cave (환선굴) is a cave located in Gangwon province, South Korea. It is one of the largest limestone caves in Asia, and the biggest in Korea, with 6.2 km of known passages and a total suspected length of 8 km, 1.6 km of which are visited by over 1 million people per year. 주소: 강원도 삼척시 신기면 환선로 800 태고 자연을 간직한 아름다운 숲속 국내 최고의 대굴 In 1966 the South Korea government designated this cave and a neig..