Son Doong is the largest cave on the planet and also the most majestic cave in Vietnam. Son Doong cave was discovered by a Phong Nha forester in 1990 and in 2009 was explored by the British Vietnam Caving Expedition Team led by Mr. Howard Limbert. , surveying and drawing. Son Doong Cave was announced by the expedition team together with National Geographic magazine as the largest natural limestone cave in the world in 2009. In 2013, Hang Son Doong was recognized by Guinness World Records as a natural cave. the world's largest.