Tags: Cave.
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. In 1966 the South Korea government designated this cave and a neighboring cave not open to the public Gwaneum cave (관음굴) National Monument 178.