Vietnamese and Japanese scientists last week announced the discovery of a lava cave system, believed to be the longest in Southeast Asia, in the Central Highlands province of Dak Nong.
Among a dozen of caves discovered, three caves have been surveyed in detailed.
The three caves named C7, C3 and A1 measure one kilometer, 594 meters and 456 meters in length, respectively, ranking the longest, the second longest and the 5th longest in Southeast Asia.
The third longest and fourth longest lava caves in Southeast Asia are also located in Vietnam: the Doi (Bat) Cave No. 1 and 2 in the southern province of Dong Nai (discovered in 2013).
So, Vietnam is now home to the top 5 longest lava caves in Southeast Asia.
Gua Lawah or Bat Cave in Indonesia ranks the sixth longest, at 400 meters.