Hang Sơn Đoòng in Phong Nha-Kẻ Bàng National Park is the largest known cave in the world, big enough to have its own jungles, weather, and… pearls?
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Sources:
http://www.igme.es/boletin/2016/127_1/BG_127-1_Art-11.pdf
https://www.nationalgeographic.com/magazine/2011/01/vietnam-cave/
https://web.archive.org/web/20150228105220/http://news.nationalgeographic.com/news/2009/07/090724-biggest-cave-vietnam
https://www.researchgate.net/profile/Fikri_Finsani/publication/322297929_Prof_Dr_Alfred_Bogli_Karst_Hydrology/links/5a51898e0f7e9bbc105436d3/Prof-Dr-Alfred-Boegli-Karst-Hydrology.pdf
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.211.701&rep=rep1&type=pdf
http://www.ryandeboodt.com/images/Hang-Son-Doong-Cave-Pearls-Phong-Nha-Ke-Bang.jpg
http://caves.org/pub/journal/PDF/V65/v65n2-Self.pdf
https://www.cambridge.org/core/books/earth-materials/1B6CFFF928CF72EAAFEAD12C4CC359C9
https://www.researchgate.net/profile/Maria_Holynska/publication/287210232_A_New_Mesocyclops_with_Archaic_Morphology_from_a_Karstic_Cave_in_Central_Vietnam_and_Its_Implications_for_the_Basal_Relationships_within_the_Genus/links/5673ed0b08ae1557cf4b6e49/A-New-Mesocyclops-with-Archaic-Morphology-from-a-Karstic-Cave-in-Central-Vietnam-and-Its-Implications-for-the-Basal-Relationships-within-the-Genus.pdf
Image Sources:
https://www.istockphoto.com/photo/gruta-de-son-doong-quang-binh-parque-nacional-phong-nha-k-bng-vietnam-gm1195256637-340638489
https://www.istockphoto.com/photo/cave-pearls-gm1211899922-351633549
https://www.videoblocks.com/video/water-droplets-landing-on-rock-and-puddle-slow-motion-srldx-3yubk07ymvkb
https://www.istockphoto.com/photo/water-splash-gm1164803185-320276644
https://www.istockphoto.com/photo/cave-shaped-limestone-geological-formations-with-beautiful-stalactites-and-gm1153759975-313470398
https://www.istockphoto.com/photo/worlds-largest-cave-han-son-doong-gm824789000-133661521
https://www.istockphoto.com/photo/hang-en-cave-vietnam-worlds-largest-cave-system-camping-tents-inside-gm1251950858-365444872
https://commons.wikimedia.org/w/index.php?curid=69990745
https://en.wikipedia.org/wiki/File:Son_Doong_Cave_5.jpg
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