Accordingly, the helicopter tours will depart on April 26 or 27. Each tour has a capacity of 20 tourists costing VND3-6 million per person. A half-day tour costs VND3 million (US$140) per tourist, while a two-day tour is VND6.3 million ($294) per tourist.

According to Mr. Nguyen A Chau, Director of the Oxalis Adventure Tours Company, all tickets for three helicopter tours to En Cave have fully booked.

The helicopter will fly around the 85,700 hectare (211,769-acre) park before flying over the Garden of Edam – a jungle housed inside Son Doong, the world's largest cave.

The helicopter will also land at the entrance of En (Swift) Cave, so tourists can explore the cave which goes 1,645 meters back into a mountain.

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.

Earlier, the Provincial People's Committee has also agreed with the Northern Helicopter Company to open pilot tours to Khe Gat, En Cave and Son Doong Cave.

(www.quangbinh.gov.vn)