Hang Va Cave

Hang Va is one of the most treasured caves in all of Phong Nha National Park, home to some of the rarest formations seen anywhere in the world. Hang Va is located deep in the park quite close to the world-famous Son Doong Cave, and it is thought to be part of the same system.

The entrance of Hang Va is actually a collapse in the floor of a steep valley, and requires a descent of about 15m down to a small stream passage that averages 5m high and wide ro reach the cave. It’s offered by Oxalis as one of the best adventure tours in Phong Nha for those looking for a challenge – but don’t be put off as its much easier than our three-day tours or Son Doong Cave Expedition.

At the end of the cave, there are fascinating wet and dry gours (pools) with numerous conical calcite formations that have been named as the Tower Cones. This cave is one of the most mysterious and magical of all caves in Phong Nha, and must-do if you have the time and energy to explore its fascinating depths. 

Hang Va Tower Cones, Vietnam Adventure

Hang Va Cave Formations

Hang Va is home to some fascinating cave formations including the tower cones, spread across an entire passage that reaches a width of about 85m. There are more than a hundred calcite cones rising from the Earth in some mysterious way.

These Hang Va Tower Cones are all very steep, and they reach heights of around 2m each. Many of the tops are at the same level, which is the same as the water level in the gour pool before it dried out. They are coated in soft mud, but this is generally only a few millimetres thick over the calcite. When washed clean of the mud, the cones reveal a complicated structure.

There is some uncertainty in exactly how these cones have formed. Their characteristics are comparable with some features of cones, recorded in other caves, that are either raft cones or geysermites, but many different processes have created their present structure, making them incredibly unique and worth visiting if you have chance.

The cones of Hang Va have many similar features of Raft Cones –  these calcite rafts usually form as a thin layer on the surface of cave pools. They sink into the pool either under their own weight when they grow too thick, or when hit by a drop of water falling from the cave roof. A repeated drip from the same place sinks a number of rafts that then build up on the pool floor to create a cone, which may reach to the level of the water surface. These are known as raft cones, because they are cones formed from calcite rafts.

Steep sided cones are more often called tower cones. It is not known exactly why some cones form very steeply, and other with a more shallow slope.

A striking feature of the tower cones in Hang Va, and those in many other caves, is the external layer of calcite that gives them a knobbly appearance and also hides any structure remaining from the original piles of rafts.

Hang Va Adventure Tour in Phong Nha

Hang Va Expedition

Our Hang Va Expedition is for those seeking a challenging jungle adventure combined with some real caving opportunities to discover some of the rarest formations in Vietnam. This tour is typically booked as an addition to the Son Doong Cave Expedition, or for those looking for a short, yet challenging ‘tour’ in Phong Nha National Park. This trip also includes a visit to Nuoc Nut, a smaller cave visited on a one-day tour by Oxalis Adventure Tours. 

This trekking tour includes up to 10km of trekking and 3 km of caving. It is considered more difficult then any other two-day experience with Oxalis. It involves rock scrambling, wading through an underground river, bouldering and rope-traversing within the cave, to reach the rarest tower cone formations.  It costs VND 8,000,000 per person (equivalent to USD 348).

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