For British travellers, an expedition to Son Doong in Việt Nam, the world’s largest cave, is among the greatest adventures they would like to undertake.

HCM CITY — British magazine Conde Nast Traveler has named Son Doong, the world's largest cave located in central Việt Nam, one of seven must-explore wonders of 2020.

“Nestled deep in the jungles of Phong Nha- Kẻ Bàng National Park in Quảng Bình Province, Son Doong Cave features the planet’s largest chamber measuring 600 feet high, 300 feet wide, and over 2.5-miles long," the magazine said.

Son Doong opened to tourists in 2013 with a five-kilometre-long system, 150 metres high and 200 metres wide, containing at least 150 individual caves, a dense subterranean jungle and several underground rivers.

Due to limited space, registration for Son Doong tours must be made well in advance with Oxalis, the only company licensed to run the service.

Quảng Bình’s government recently increased the number of tourists allowed to visit the cave in a year from 640 to 900.

A four-day expedition costs US$3,000, with buses running from Hà Nội to Quảng Bình, and on to the Phong Nha Ke-Bang National Park.  VNS