Lung Khuy Cave

Inside a limestone mountain in Quản Bạ commune, there is a space of more than 14,000 square meters. Four entrances open from it, at a height of almost 900 meters.

This is Lùng Khúy Cave.

In the local language, the name Lùng Khúy is usually explained as "dragon in a rock crevice" or "dragon in the rock". People here pass down a legend about the dragon god, a Hmong girl and a magical well deep inside the cave. It is a folk story that has lived for many generations beside this mountain.

The cave lies in the village of Lùng Khúy, within Tuyên Quang province. Before 2025, this area belonged to Hà Giang province. On July 1, 2025, Hà Giang and Tuyên Quang merged, and the place now belongs to the new province.

In 2016, the Vietnam Institute of Geosciences and Mineral Resources surveyed the cave. The communications and education board of the Hà Giang provincial Party committee later republished the figures. The cave measures 517.5 meters in length and 31 meters in depth. Its total area is 14,983 square meters. The four entrances lie between 875 and 891 meters above sea level. These are more than abstract figures. They show a large karst cave system, formed in limestone inside the Đồng Văn Karst Plateau UNESCO Global Geopark. A UNESCO Global Geopark is an area with landscapes of international geological importance, managed for protection, education and sustainable development.

UNESCO describes the Đồng Văn plateau as limestone country with a geological history of more than 550 million years and many important karst features. Lùng Khúy Cave formed in that setting. Water seeps through cracks in the rock and dissolves calcium. Over tens or even hundreds of thousands of years, it cut deep into the limestone and left chambers and narrow passages. Around the cave, the land is karst of clustered valleys and peaks, with hanging valleys and sinkholes. That land took shape in an ancient sea more than 400 million years ago.

Inside are stalactites, stalagmites, stone columns and stone curtains. Along the visitor route, which runs more than 400 meters, they appear together with stone rims. Every one of these formations comes from water dripping off the ceiling. The water carries calcium, and it leaves it behind one millimeter at a time, over many centuries. The sound of dripping water is the voice of this place. It shows that the cave is still "growing", very slowly.

Steps, an iron staircase and lights now let a visitor walk the whole route, stopping at the columns and stalactites one by one. The entrance is about 2.5 meters high and 4.7 meters wide. It opens onto a world quite unlike the one outside.

The cave opened to visitors in 2015.

Inside limestone more than 400 million years old, the dripping water goes on with its work. Lùng Khúy is not loud or grand like the famous caves, but it has a simplicity and a stillness that few places have kept.