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I smile at our guide"s warning & enter the lush jungle growing inside Hang Son Doong, a 3-million-year-old cave in the central part of Vietnam. Water drips from a gaping scar in the ceiling over 100 meters (328 feet) above us. A spectacular sunbeam starts to lớn creep down the side of the serrated cliffs. The shrill hotline of birds và macaque monkeys echoes off the limestone, drifting in from the unseen world beyond the skylight.
"Watch out for dinosaurs. That"s what we called this place when we first discovered it," caving expert Howard Limbert, elaborates. The prehistoric atmosphere made the reference obvious.
We continue on, stepping deeper into the void that is considered by some to lớn be the largest cave in the world.
Located in the heart of the UNESCO-listed Phong Nha-Ke Bang National Park in Vietnam"s quang đãng Binh province, Hang Son Doong is one of the most captivating destinations that can be experienced in Southeast Asia.

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More people have stood on the summit of Mount Everest than have witnessed the surreal beauty inside these enormous chambers. Translated as Mountain River Cave, it was first discovered in 1990 by Ho Khanh, a local farmer who was seeking shelter from a passing storm in the jungle.
He noticed clouds and the sound of an underground river gushing from a large hole in the limestone, & reported his findings khổng lồ the British Caving Research Association (BCRA), who were stationed in Phong Nha at the time.
Unfortunately Ho Khanh lost his bearings during his return, và the exact location of the cave remained lost for 18 years. In 2008 while hunting for food he stumbled across the entrance again, và returned the following year with Howard và Deb Limbert from the BCRA.
They began the exploration of the cave, and in 2010 determined it lớn be the largest ever discovered in terms of the size of its cross-section. The news shook the caving world.