A caverna Son Dongong no Vietnã é a maior caverna do mundo e contém seu rio e até mesmo uma selva. Tem mais de 8 km de comprimento e parece uma caverna, o suficiente para abrigar um arranha-céus! A primeira expedição partiu em 2009 para explorar este mundo subterrâneo antes de ser bloqueado no interior por um muro de calcita de 200 pés de altura. Grande parte da rede circundante de mais de 150 cavernas perto da fronteira com o Laos ainda não foi explorada.
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