Kong Collapse, often hailed as the deepest sinkhole in Vietnam and ranking among the deepest on our planet, is a realm of untold mysteries hidden in its uncharted crevices, caves, and depths. If adventure runs through your veins, Kong Collapse is a destination you can’t miss.
Kong Collapse: A hidden world of untold mysteries
Kong Collapse, also known locally as Ho Sut Kong, is a sinkhole of immense proportions within the renowned Phong Nha – Ke Bang National Park, Son Trach Commune, Bo Trach District, Quang Binh Province. This stunning geological wonder, created millions of years ago by the collapse of a massive cave ceiling, forms a spectacular chasm with a remarkable depth of 450 meters, ranking among Earth’s deepest sinkholes.

Picture yourself standing at the precipice, the height equivalent to a nearly 30-story building, before descending into an awe-inspiring landscape teeming with forests and mountains within pristine caves. The main cave bed itself spans a remarkable 125 meters in width and 80 meters in height, adorned with superb formations of varied shapes, a testament to nature’s artistry over millennia.

The sheer scale and unique beauty of Kong Collapse defy simple description, offering a sensory experience that words can barely capture. This ‘closed sinkhole’, as it was initially dubbed due to its isolated nature, continues to beckon explorers and captivate those with a passion for the untamed beauty of the wild.
History and the story behind the name
Initially referred to as Enclosed Doline or Ngo Cut (dead end), the sinkhole’s name evolved with further exploration. The story of Kong Collapse began in 1997, when a keen-eyed British cave expert stumbled upon it during an annual expedition to the remarkable Phong Nha – Ke Bang region. At that time, due to its secluded location and the initial lack of a clearly defined exit, it left cave enthusiasts to ponder its mysteries based on maps alone.
During subsequent expeditions, equipped with more advanced technology, the team successfully discovered both the entrance and the exit of the cave system connected to the sinkhole. This significant breakthrough led to the renaming of the sinkhole to Kong Collapse.
The new name directly references the distinctive shape of the sinkhole’s mouth, which strikingly resembles the head of the giant ape Kong from the Hollywood blockbuster. This evocative name perfectly captures the majestic and somewhat imposing nature of this incredible natural wonder. Over two decades later, the quest to fully understand Kong Collapse took a thrilling turn.
Why is Kong Collapse a majestic destination like no other?
Kong Collapse stands as a truly exceptional destination for adventure seekers for a multitude of compelling reasons. Experts within the speleological community consider it a remarkable marvel within the limestone mountain system of Phong Nha – Ke Bang. This unique cave system, sculpted by nature over countless millennia, boasts extraordinary features unlike any other. Its vertical heights akin to giant skylights and remarkably minimal slopes within the sinkhole itself create an undeniable allure.

The journey to and through Kong Collapse is an adventure in its purest form. Reaching it offers three distinct access points: a exhilarating swim in pitch-black caves, a heart-pounding rope swing that drops 100 meters straight down into the sinkhole, and a challenging trek through the dense forest. This variety of access options contributes to making a visit to Kong Collapse one of the most thrilling cave adventure tours in Vietnam, brimming with rigorous challenges.
Beyond its visual splendor, Kong Collapse is also a sanctuary for a rich and isolated ecosystem. This extraordinary environment nurtures rare flora and fauna, with numerous species having evolved into unique endemics exclusive to this region. The thriving biodiversity, encompassing vibrant plant life and distinctive wildlife, adds a profound layer of intrigue to the exploration. This makes every encounter with these natural wonders an unforgettable experience that highlights the ecological significance of Kong Collapse.

Indeed, Kong Collapse is not merely a sightseeing trip. This journey pushes adventurers to their limits while unveiling unparalleled natural beauty, from dramatic landscapes to vibrant ecosystems. The experience fosters a deep, almost spiritual connection with nature, leaving explorers awestruck by the raw power and serenity of the environment. Each step through Kong Collapse rewards with unforgettable vistas and a renewed appreciation for the wonders of the wild.
Recommended 3-day itinerary to conquer Kong Collapse
Embarking on a 3-day exploration of Kong Collapse promises an unforgettable adventure. Here’s a glimpse into a suggested itinerary based on traveler experiences:
Day 1: Approximately 7km forest trek, 350m cave swim, and overnight stay at Kong Collapse
After a hearty breakfast, you’ll transfer to the edge of the pristine forest, the starting point of your journey at around 6 AM. The first section involves an approximately 7-kilometer trek through the lush, primeval forest. The terrain is described as relatively easy, mostly downhill, making it manageable for those with a moderate level of fitness. Remember to embrace the wilderness as there is no phone signal in this area.

After roughly 3 hours of trekking, refueled with a well-deserved lunch break. Having rested for a while, you’ll continue your trek for another two hours through relatively easy forest paths until you reach the entrance of the cave leading to Kong Collapse. The next part of the journey is a thrilling 350-meter swim through a dark and cold underground river within the cave. This part can be quite an experience, with complete darkness and chilly water adding to the adventure. However, for those who are not comfortable swimming in the dark, there is an optional raft ride provided by the porters, ensuring everyone can reach Kong Collapse.

Emerging from the dark cave, the sight of the magnificent Kong Collapse is a truly rewarding moment. You’ll have time to take in the sheer scale and beauty of the sinkhole before settling into the campsite set up within its base. As night blankets the sinkhole, you’ll fall asleep beneath its towering walls and open sky, embraced by nature’s silence. There’s nothing quite like drifting off under the vast remote and raw Kong Collapse.
Day 2: Traverse through 3 caves: Tiger Cave – Over Cave – Pygmy Cave
The day starts with a unique photo opportunity: a short 8-meter rope swing within the sinkhole. The journey continues as you navigate through a relatively small passage leading from Kong Collapse into the cave system. This initial section can be tight, requiring you to push your daypack ahead in some spots. Beyond this, the caves open up into incredibly vast and wide spaces, making you feel small in comparison.

The first stop is the back entrance of Tiger Cave, a truly wild and untouched area. The vegetation here has a prehistoric feel, also offering fantastic photo opportunities. After exploring this area, you’ll head back into the cave to continue towards Over Cave. This section of the exploration primarily involves walking and admiring the stunning stalactite and stalagmite formations. If you are a fan of cave formations, be sure to bring a powerful headlamp to fully appreciate their intricate details.

The final cave of the day is Pygmy Cave, known as the fourth-largest cave in the world according to the guides. Exploring Pygmy Cave is more physically demanding, often involving rope-assisted sections that test your strength and stamina. You’ll even get to traverse along a unique rock formation known as the “Dinosaur’s Backbone”.
The reward for navigating these challenges is reaching the campsite located at the entrance of Pygmy Cave, your resting place for the second and final night of the expedition. This location boasts a remarkable stalagmite formation nicknamed the “Birthday Cake,” reminiscent of formations found in the famous Son Doong Cave.

Day 3: The final chapter of your journey
The journey wraps up with a final trek back to civilization. The return journey primarily follows forest trails. While not overly long, some sections can be quite steep, providing a final physical challenge. Some travelers choose to extend their stay in Quang Binh to explore other attractions like Phong Nha Cave or enjoy a relaxing paddle on the Son River. However, the raw, untamed beauty of the Kong Collapse experience is often considered the highlight of any trip to this region.
Read more: Escape to Da Nhay Beach: A serene paradise in Quang Binh
Don’t dive in blind: Must-know tips for Kong Collapse
Embarking on the Kong Collapse adventure requires careful preparation and adherence to certain guidelines to ensure a safe and enjoyable experience.

Requirements to Explore Kong Collapse
The Kong Collapse tour is a demanding physical and mental challenge and is not suitable for everyone. To participate, individuals generally need to:
- Pass a medical examination to ensure they are in good physical health.
- Pass a safety skills test to demonstrate their ability to handle the challenges of the trek and cave exploration.
- Be prepared for rigorous activities such as long treks, swimming in cold and dark conditions, climbing, and potentially using ropes.
Packing list for your Kong Collapse exploration
It’s essential to bring personal items for comfort and safety. Based on experienced travelers, must-haves include sturdy, waterproof trekking shoes and a 20-40L backpack for daily essentials. A lightweight sleeping bag, waterproof dry bags, and a reliable headlamp with extra batteries are also recommended. Quick-drying clothes, swimwear, and water shoes help with comfort.
Don’t forget insect repellent, a personal first-aid kit, high-energy snacks, trekking poles, and a reusable water bottle to stay energized and safe. If you book a tour operator , they will provide much of the necessary equipment for you.
Adhere to safety rules
Safety is the top priority on the Kong Collapse tour. It is crucial to:
- Work as a team and support your fellow explorers.
- Use all safety equipment correctly, including harnesses, ropes, and helmets.
- Be aware of potential hazards such as sharp rocks, steep inclines, and slippery surfaces.
- If you’re joining a tour, listen carefully to and follow the instructions of your guides and safety assistants at all times. Crucially, inform the tour operator in advance of any medical conditions or allergies.
Conserving the natural world
As you explore this pristine environment, it is vital to minimize your impact and help preserve its beauty. Always remember to pack out what you pack in – never leave litter behind. You should also stick to marked trails to protect fragile vegetation and avoid disturbing wildlife and respect cave formations by not touching or removing anything. It is encouraged to keep noise levels low to maintain the peaceful atmosphere and use reusable bags and containers to cut down on plastic waste.
Founded in 2007, Lily’s Travel has grown into one of Vietnam’s most reliable and well-loved travel agencies. We offer a wide range of tours across the country, complete with detailed itineraries, thrilling experiences, and 24/7 customer support which is everything you need for an unforgettable, worry-free adventure.
Visit the official website Lily’s Travel or contact Tel/WhatsApp/Viber: +84931152368.
Kong Collapse is the ultimate expedition that true adventurers never want to miss. Let’s venture deep into Vietnam’s untouched wilderness, where dense jungles, hidden rivers, and massive cave chambers await, and face the rush of a 100-meter rope descent and swim through shadowy underground waters. Pack your bag and embark on a journey to Kong Collapse that will leave you with memories to last a lifetime.