Hang Va Cave
Tu Lan Cave System is comprised of over 10 caves in all, some of which were originally discovered and explored in 1992, and some of which were just found in the past couple years.
Hang En Cave (Hang Én) is the world’s 3rd largest cave, succeeded only by Deer Cave in Malaysia and Hang Son Doong, also located here in the Cave Kingdom of Vietnam, Phong Nha-Ke Bang National Park.
Son Doong Cave is located in the heart of the Phong Nha Ke Bang National Park in Quang Binh province of Central Vietnam. Only recently explored in 2009-2010 by the British Cave Research Association, Son Doong Cave has only been open to the public since 2013. All research and tourist expeditions have thus far have been organized and led by local adventure tour company Oxalis, in partnership with British Cave Research Association and with the permission of the government of Vietnam.