Water Cave Introduction: The Yanzi Cave Water Cave is more than ten feet high, with dense stalactites on the top of the cave. The underground river section of the Shanghai River flowing into the cave is seven or eight kilometers long. There are dozens of large and small halls in the cave, the largest of which is as large as It has more than 20,000 square meters, hundreds of scenic spots, a tourist area of more than 40,000 square meters, and the scenery is breathtakingly beautiful.