Two caves in the Phong Nha-Ke Bang National Park in Quang Binh Province have been ranked as the largest and third largest caves in the world.

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The British Cave Research Association (BCRA) have ranked two caves in Vietnam as the largest and third largest in the world.

They are Son Doong and En in the Phong Nha-Ke Bang National Park in Quang Binh Province. Son Doong also set a Guinness record as the world’s largest natural cave in 2013. — VNS

Source: https://vietnamnet.vn/en/travel/vietnam-s-caves-among-world-s-largest-705146.html