Introduction to Sanjiao Lake: It is located in the northwest of Zhuozhai (HANGTRAI) Island and is located on Xiaoniutou Island. It is famous for its beautiful scenery. There are three water lakes here, all connected by three water cellars. You can only enter by taking a small bamboo boat through the passage under the mountain. In the long and dark passage, there are many stone milk hanging down to the water from the top. There are some plants growing on the stone wall outside the entrance of the passage, such as orchid and cocktail bamboo.