Son Doòng Cave, located in the core zone of Phong Nha – Ke Bang National Park, Quang Binh province, Vietnam – is a largest cave in 2009-2010.
Son Doong cave was formed on a faulty part of the Truong Son mountain range and has been eroded by the water of Rao Thuong River for millions of years, creating a giant tunnel under the limestone layer. To explore the oldest limestone cave system in Asia and the world’s largest, you can sign up for Oxalis Adventure for a 4-day-3-day trip for $ 3,000.
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