( — Vietnam already has a worldwide reputation for its food, beaches, ancient history and diverse landscapes. And, over the past decade, it"s also emerged as one of the world"s leading destinations for caving.
Quang Binh province in central Vietphái nam is particularly famous, thanks khổng lồ the UNESCO-protected Phong Nha-Ke Bang National Park -- also known as the Kingdom of Caves. Last year alone, the region welcomed more than 3.9 million visitors, representing an 18.2% uptiông xã compared with the year prior.
"Vietphái mạnh has some of the best caves in this world. The temperatures are pleasant all year, the jungle scenery is beautiful, there are stunning formations... It"s all untouched & pristine -- nothing"s been damaged," Howard Limbert, technical advisor at the Quang Binh-based Oxalis adventure tour company, tells Travel.
"My team has explored more than 500 caves in Vietnam giới. But we"ve still only explored about 30% of this area. There are many, many more caves to be discovered."
For those keen to lớn explore Vietnam"s most mesmerizing underground worlds, here are a few worthy adventures khổng lồ consider:
Divers have discovered an underwater tunnel that connects Vietnam"s Son Doong -- the world"s largest cave -- with another enormous cave.
Said to be the largest cave sầu in the world, Son Doong currently stretches across 38.5 million cubic meters (about 1.35 billion cubic feet) -- so big, it even has its own jungle inside.

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Following a recent discovery of an underwater tunnel that connects Son Doong with neighboring Hang Thung cave, it could be an additional 1.6 million cubic meters larger than previously thought.
Oxalis, in partnership with the British Cave sầu Research Association, has exclusive access lớn the cave, bringing small groups of six khổng lồ 10 people on four-day treks during dry season from January lớn August every year.

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On the first day, travelers hike through the jungle for about an hour before stopping for lunch in the village of Ban Doong.
After a few more hours of trekking, the group sets up camp inside Hang En Cave sầu (the third largest in Vietnam) where you can swim in underground rivers và refuel with Vietnamese cuisine.
The next day, hikers continue the journey khổng lồ reach remote Son Doong Cave sầu where they"ll don safety harnesses then use ropes lớn descend down an 80-meter-tall rock wall.
Once inside, travelers spend the next two days exploring the immense cave"s ancient fossils, underground jungle, stalagmites và underground rivers.
The journey culminates in an epic scramble up the "Great Wall of Vietnam" -- an 80-meter-tall rock wall that requires a mix of scrambling and climbing of ropes & ladders.
"This is definitely not just a stroll. There are lots of river crossings, superb jungles, mountains and cliffs all around, plus lots of wildlife ... lượt thích birds & monkeys that are endemic khổng lồ this area," says Limbert. "A lot of people find the scenery as spectacular as the cave itself."

On the first day, you"ll take a two-kilometer trek lớn Nuoc Nut cave sầu, where an incredible underwater river awaits inside.
A 100-meter swyên through the river passage connects you lớn the entrance of Hang Va cave, where travelers camp for the night.

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While more accessible than Son Doong, the cave sầu expedition is still an adventure with lots of opportunities lớn hike through thiông xã jungle foliage, climb over rocks, traverse subterranean rivers and admire surreal stalactites và stalagmites.
"It has more than 100 rare calcite rochồng formations called tower cones," says Limbert. "They"re essentially stalagmites that formed underwater -- & they"re incredibly rare!"