Introduction to Surprise Cave: is located on the BOHON Islands, about 15 kilometers away from the tourist pier. It is one of the largest and most beautiful caves in Ha Long Bay, covering an area of ​​about 10,000 square meters, with three rooms: an outer, middle and inner room. One of the features of Surprise Cave is that there are countless small nests on the top of the cave. After entering the cave, visitors feel as if they are walking under a cloud-covered sky.