To reach Sinh Ton valley - Thuy Cung cave, visitors will have to trek through the vast grass hills to Dau Rai ancient forest temple, go through the sky gate, wade Tien stream to reach Nuoc Lan cave, this is the main place. is the back door of Dark cave. Looking from a distance, Nuoc Lan cave looks exactly like a wine bottle of ancient fairies. This place is surrounded by large groves of trees like a screen protecting the cave entrance. The green color of the forest trees mixed with the limestone color at the cave entrance will stimulate the curiosity of many visitors.