The Wedding Cake stalagmite (also known as Wedding Cake) in Doline 1 of Son Doong Cave features hundreds of rimstone layers stacked on top of each other. It formed the shape of a gigantic cake. The top of the stalagmite has been smoothed by a waterfall, creating a flat surface, like a stage where nature performs its exceptionally rare light shows (sunbeams). Wedding Cake feels like a solemn ceremony. It is deliberately arranged by nature to welcome travelers who journey across remote mountains and forests to witness the timeless beauty within the world’s largest cave.
Overview and how to get to Son Doong Cave
Sơn Doong Cave is located in the core area of Phong Nha – Ke Bang National Park, in Phong Nha Commune, Quang Tri Province (formerly Quang Binh Province). To visit, travelers must book the Son Doong Expedition tour, operated by Oxalis Adventure. First of all, travelers make a reservation on the Oxalis Adventure website. They need to provide complete information about their health and physical fitness, and select an available departure date.
On the departure day, travelers will go to Dong Hoi Airport or train station, where Oxalis transfer vehicles will take them to Phong Nha. The expedition begins at the Oxalis office. Participants will trek for more than 1.5 days, covering approximately 13km through forest and cave paths to reach the entrance of Son Doong Cave.
From the cave entrance, travelers will trek about 3km to the campsite near Doline 1. The next morning, the group will explore Doline 1 and ascend Wedding Cake. Travelers can climb steep rock slopes to reach the top of the giant Wedding Cake stalagmite, marvel at the spectacular natural scenery, and capture stunning photos. After half a day of exploration, the expedition will continue to conquer the magnificent wonders awaiting in the rest of Son Doong Cave.
Instructions on reaching Son Doong Cave and a detailed expedition itinerary can be found in the article “How to get to Son Doong Cave”.
Formation of Wedding Cake in Son Doong Cave
The Wedding Cake stalagmite is located in Doline 1 – Watch out for Dinosaurs, about 3km from the cave entrance. Doline 1 was formed as the underground river continuously eroded the cave rock. Around 500,000 years ago, the cave ceiling above the doline became thinner and could no longer support its weight, causing it to collapse. The collapsed area created an inverted funnel reaching up to 450m in height, with the widest point at the cave floor measuring 125m.
Wedding Cake was formed directly beneath the collapsed doline. The stalagmite is primarily composed of rimstone (or gour dams) combined with waterfalls cascading from the high cave ceiling. Each rimstone layer is enormous, with round or oval shapes stacked from the cave floor to the top, where the upper layers are gradually smaller than the lower ones in a uniform pattern.
The top of this massive stalagmite is directly affected by the strong waterfall, which usually occurs during the rainy season or on days of heavy rain. Falling from hundreds of meters, the water exerts a significant force, causing the tip of Wedding Cake to be flat rather than pointed like other stalagmites.
After cascading down, the water spreads in all directions, creating concentric ripples that extend outward from the center. Over time, rimstone forms along the flow, creating circular patterns resembling a wedding cake. The entire stalagmite and the surrounding rock slopes receive both light and water, allowing plants such as mosses and algae to thrive, covering the doline in green.
Initially, this stalagmite did not have a specific name. However, during one expedition, a traveler stood on top of the stalagmite to propose to his girlfriend. Because of the shape of the stalagmite and this touching story, people began calling it Wedding Cake.
Exploring Wedding Cake on the Son Doong Expedition
Camping beside Doline 1, marveling at the magical scenery, and climbing the rugged rock slopes to conquer Wedding Cake are unforgettable highlights of Son Doong Cave.
Travelers will explore Doline 1 and Wedding Cake on the third day of the Son Doong Expedition. From Campsite 1, they can view the landscape of Doline 1 from a distance, where morning light gradually spreads across the vast space. After breakfast, the expedition begins, climbing several rock slopes and passing through small cave arches. They will ascend ropes along the “dinosaur spine” slope to reach the top of Wedding Cake. Travelers can witness sunbeams like stage lights and take in the expansive cave space below.
After enjoying the view and taking photos, the group will descend the rock slope to the base of Doline 1 – a spot reminiscent of a Dinosaur in the movie Jurassic Park. This is where travelers can capture panoramic photos of the majestic doline along with the impressive stalagmite. The group will have lunch at the base of Doline 1 before continuing the Son Doong Expedition.
From January to March, when the cave temperature ranges from 17 to 22°C, the air inside the cave is clear, and travelers can see natural light streaming through Doline 1. Especially on sunny days, sunbeams can appear in Doline 1 from around 11:00 to 13:00.
From June to August, when the cave temperature ranges from 22 to 25°C, moisture rising from the underground river forms floating clouds. Especially on rainy days, the waterfall from the top of Doline 1, nearly 450 m high, cascades onto the top of Wedding Cake, creating a spectacular and impressive scene. Travelers can observe from a distance and capture striking panoramic photos.
Tips and notes for exploring Son Doong Cave and Wedding Cake
Travelers who wish to explore Doline 1 – Watch out for Dinosaurs – and Wedding Cake must join the Son Doong Expedition tour and book in advance on the Oxalis Adventure website. To prepare for the expedition and ensure an ideal travel experience, travelers should keep the following points in mind.
Ideal time to explore Son Doong Cave
The best time to trek and explore Son Doong Cave is from January to August, with the forest and cave landscapes changing noticeably each season:
- From January to March, it is late winter and early spring in Quang Tri, so the weather is slightly cool, and the trekking trails are quite comfortable. This period also offers many opportunities to see sunbeams inside Son Doong Cave. The cave scenery also appears bright thanks to the natural light entering from outside.
- From April to May, it is spring, and the ecosystem in Phong Nha – Ke Bang National Park thrives, with forest flowers in full bloom and plenty of warm sunshine. This period also marks the start of the swallow breeding season. Therefore, when visiting and camping in En Cave (a stop on the Son Doong Expedition tour), travelers can see a lot of swallows. It nests on the cliffs and flies around the main and back entrances.
- From June to August, it is summer. Although the weather outside can be hot, with temperatures reaching 37–38°C, most of the trekking trails pass under cool, green forest canopies. Inside the cave, temperatures remain around 22–25°C. This period also features the appearance of misty clouds slowly drifting over the campsites and dolines within Son Doong Cave.
Son Doong Expedition tours are temporarily suspended from September to November (the rainy season in Quang Tri) and in December to allow nature to recover and restore the cave’s pristine ecosystem.
Notes for exploring Son Doong Cave
The natural and geological wonders of Wedding Cake and Son Doong Cave are incredibly significant, as nature has spent millions of years continuously shaping them. The professional operation of expedition tours has allowed thousands of travelers, scientists, and filmmakers to fulfill their passion for exploration. Besides, they also bring the beauty of Son Doong to the public.
At the same time, nature conservation in the Son Doong Cave is always a top priority to preserve its magnificent beauty for future generations. Oxalis Adventure, the only company operating Son Doong Expedition tours, has implemented various measures to protect the cave’s natural environment and landscapes, such as:
- Limit the number of travelers to 1,000 expeditions per year and 10 travelers per tour.
- Provide reusable water bottles for travelers and use water filtration systems at campsites.
- Set up environmentally friendly composting toilets at the campsites.
- Carry all waste, including trash, human waste, and leftover food, out of the forest and cave for composting.
- Mark paths inside the cave with ropes and encourage travelers to stay within the designated areas.
- Dismantle campsites and thoroughly clean up after each tour season, restoring the cave and forest to their natural state.
Oxalis also encourages travelers to help protect the environment by:
- Do not move freely in the forest or inside the cave.
- Do not touch the stalagmites and stalactites inside the cave.
- At Wedding Cake, travelers can walk around the rock slopes to climb to the top of the stalagmite. However, they must ensure that they do not damage the geology or structure of the formations.
- Do not use bath soaps or shampoos containing chemicals when bathing in lakes or underground rivers.
- Do not dispose of trash in designated areas (campsites provide trash bins) and litter in the forest or cave.
- Avoid loud music or conversations to prevent disturbing the natural environment of the pristine ecosystem.
The mysterious world of Son Doong Cave constantly surprises travelers at every turn. The cave entrance is small yet plunges 80 meters deep, and the river produces a soothing roar that echoes throughout the space. This place also has narrow fossil corridors with crystal-clear streams and magnificent stalagmites. All of them combine to create a mysterious and magical world that calls adventurous hearts to explore, conquer, and admire nature’s masterpiece.
Currently, the Son Doong Expedition tours are fully booked through the end of 2027. Schedules in 2028 are now available for booking on the Oxalis Adventure website. Travelers who wish to conquer the world’s largest cave and witness the breathtaking beauty of Wedding Cake firsthand should book early to secure a convenient itinerary.