Son Doong Cave – Did you know that the world’s largest cave was discovered in 2009? Son Doong Cave – Did you know that the world’s largest cave was discovered in 2009? Hang Sơn Đoòng – It is located in the Phong Nha-Kẻ Bàng National Park in Vietnam, which contains the oldest karst system in Asia, between 400-450 million years old. It has a depth of 150 meters and a distance of… JanithAugust 21, 2019August 21, 2019 Asia, Nature, Science, Travel, Vietnam No Comments Son Doong Cave – Did you know that the world’s largest cave was discovered in 2009?Read more