Located in the heart of the Phong Nha-Ke Bang National Park, the cave, which is more than 200 metres in width, 150 metres in height and approximately 6.8 kilometers in length, was explored by the British Cave Research Association during 2009-2010 and it has been open to the public since 2013. It is believed to have been formed 2-5 million years ago.

Inside Son Doong Cave.

Son Doong Cave has been recognized as the largest of its kind in the world by three international record-keeping organizations – Guinness, the Association World, and WorldKings.

Recently it has been ranked third among the worldwide bucket-list trips for 2019 by Lonely Planet, a prestigious travel guide magazine.

The cave attracted 243 tourist arrivals from 34 countries and territories across the world who joined 32 pilot tours “Conquering Son Doong-the world’s largest cave” operated by the Phong Nha-Ke Bang National Park management board and Oxalis Adventure Tours in 2013. It generated over VND15 billion (US$645,600) for local tourism in the eight-month trial period.

The tours created stable jobs for 40 locals, with an average income of VND6 million (US$258) per month at that time. Taking the cue from the adventure tours, local tourism services have been developed as well.

Besides, the Son Doong tours have helped popularise the UNESCO-certified Phong Nha-Ke Bang National Park as well as the province’s tourism to the world.

Holding important scientific values, in terms of geology, geomorphology and ancient climate, the cave has been favored by many scientists and science channels worldwide.

The eco-system inside Son Doong is as unique as it is large, and it even has its own localized weather system. Rare limestone cave pearls are scattered in dried pools, and the largest stalagmite ever found stands 80 meters tall.

Collapsed ceilings have created openings known as dolines, allowing foliage plants to grow inside the cave. Microscopic organisms thrive in the darkness.

According to an initial study from the Vietnam Academy of Science and Technology, besides 161 species of flora found inside Son Doong, the cave is home to 300-million-year-old coral fossils which are valuable for the analysis of geological layer changes through times.

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Source: NDO