Phuong Hoang Cave is located on Phuong Hoang mountain in Vo Nhai district, 45km from Thai Nguyen city along National Highway 1B (Thai Nguyen - Lang Son). Looking up from below, the mountain has the shape of two phoenixes lying side by side. The reason why the mountain is named Phuong Hoang is because according to an old legend on the mountain, there was a pair of phoenixes who lived very happily and they gave birth to two eggs. Every day, the father bird goes to find food for the mother bird to lay eggs. Until one day, engrossed in a new flock of female birds, the father bird forgot his duty and did not return. Then one day suddenly realized, it came back but the wife bird was petrified. Regretfully, the father bird lay on the opposite mountain looking forward to expect his wife to return to normal, but waiting forever it also turned to stone, Since then the mountain has been named Phoenix. From the foot of the mountain to the entrance of Phuong Hoang cave, you have to climb a long way of cat ears, which takes more than an hour. Phoenix is ​​a large cave and has a strange beauty.