Oxalis, an adventure-tour operator, and Northern Helicopter Company launched helicopter tours to En Cave in Phong Nha—Ke Bang National Park in Quang Binh Province.
Each tour has a capacity of 20 customers costing VND 3-6 million per person.
En Cave is the world’s third largest cave. The largest cave found in the world is Son Doong in Quang Binh Province and the second largest is Deer Cave in Malaysia.
|En Cave in Phong Nha—Ke Bang National Park (Photo: Sggp)|