Speleology. Old cave washed by an underground river in the mountain. - Ponor (swallow hole), gypsum cave. Bizarre forms of stalactites and gypsum incr
Speleology. Old cave washed by an underground river in the mountain. - Ponor (swallow hole), gypsum cave. Bizarre forms of stalactites and gypsum incrustations (speleothem). Laos
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Photo credit: © Maximilian Buzun / Alamy / Afripics
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