natural cave with underground river (laos)

Natural cave (Laos)

Spotted near the road that goes East from Vieng Xai.­ I bet this large cave has never been explored.­ The river flows toward the cave and disappears in the darkness.­

backlight cave formations cave mouth caving concretions natural cave river cave speleothems spelunking stalactites underground river viang xai
Viang Xai, Laos

Photos taken in Laos