The first destination is Co Noi Cave, located at the foot of the limestone mountain in Co Noi village. From afar, the entire cave entrance is covered in green forest trees. Above the cave, the roots of ancient trees stretch out, clinging tightly to the cliff, creating a primitive, mysterious look. Accompanying us, Mr. Luong Van Thenh, Head of Co Noi village, said: This is a complex of 1 large cave and small alleys branching off in many directions. The length of the main cave is more than 1km, the height from the cave ceiling to the ground is about 20m. Indeed, after walking more than 100m, through a narrow crevice, before our eyes is a fascinating work of art with stalactites hanging down, creating vivid, strange shapes that have been painstakingly carved by nature over millions of years. On both sides of the wall, the layers of white stalactites look like interwoven icebergs, layer upon layer, magnificently. The cave ceiling is also covered with a layer of sparkling white stalactites with countless smooth stalagmites forming beautiful patterns that satisfy the rich imagination of the viewer. In particular, from the cave ceiling, many stalagmites diligently drip drops of pure water to create new stalactites, creating a crackling sound that makes the space more magical and mysterious. The further into the cave, the more pristine and strangely beautiful the scenery is, the stalactites are about 2 meters high, it takes 3 people to hug them, the rock piles, stalagmites with a variety of different shapes such as: elephants, custard apples, raspberries, ancient banyan trees with lush foliage, some places look like flowing waterfalls... The cave floor stretches along the slope, divided into gentle sloping lines like terraced fields, containing tens of thousands of small marbles of different sizes, creating a rustling sound when stepping on them. After more than 1 hour of exploring the cave, we left Co Noi cave to Huoi E cave, Nam Ngua village, in the "Dan Huou - Nang Khoc" mountain range. Huoi E cave has a more complex terrain than Co Noi cave, the path is divided by large rocks, suitable for tourists who love climbing and adventure. Through research, it is known that: The depth from the discovered cave entrance is about 1,500m, but the exact length of the cave is still unknown because it has not been fully explored. True to the name Huoi E (in Thai, bat cave), there are hundreds of bat nests clinging to the cave walls; awakened by the light of the flashlight, the bats fly chaotically throughout the cave. In addition to the sparkling, consecutive stalactite gardens, the rich shapes still retain their wildness. More specifically, inside the cave there is the clear Nam Ngua stream flowing through, at the bottom is a carpet of smooth green moss, the water surface is as calm as a large mirror reflecting on the cave wall, combined with the light of the flashlight to create a shimmering, magical image. In the rainy season, when the water rises, fish from outside enter the cave, just wait until the water recedes, enter the cave to catch a lot of fish. Although Huoi E Cave is not wide, it is extremely deep, going deep into the cave, it is like getting lost in a maze of countless mysterious stalactites.

For the convenience of visitors, Muong Chien commune is building an asphalt road from the commune center to near the cave entrance. The commune has also surveyed Co Noi and Huoi E caves with the desire to develop discovery tourism.