Longtouyan (Korean: ) is located on the coast of Longtan Cave in Jeju City, Jeju Island, South Korea. It is a huge volcanic rock formed by the cooling of the Halla Mountain volcanic lava 2 million years ago. The faucet rock is 10 meters long and 30 meters high. Because it is shaped like a faucet and there are rocks near the coast, it is called the leading rock. Legend has it that a dragon who lives in the Dragon Palace in the sea wants to ascend to heaven, but only the jade beads of the Halla Mountain spirit can be used. So, it tried its best to finally steal the jade beads of the Halla Mountain gods one day. But after it succeeded, it went to the beach, and when it was about to ascend to heaven, it was discovered by the gods, and an arrow hit the sea and fell into the sea. The dragon was resentful because he did not realize his desire to ascend to heaven. In the end, he became a dragon-shaped boulder in his struggle, only revealing a head on the sea, and he was sighing. The leading rock has a dragon pool about 200 meters to the east. It is said to be the place where dragons swim, so the name Longchi is also called Longyuan. The pool water is crystal clear. It is a symbol of Jeju tourism, the starting point of the coastal road, and the most prominent piece of rock on the west coast of Jeju Island. Longtou Rock and Longchi are also good places to go for a night out. The top of the leading rock, such as the fascinating faucet of Yangtian, is a symbol of tourism in Jeju. At dusk, gazing at the leading rock in the sunset for a long time, it really produces the illusion of a dragon. Longyuan pool water is clear. The rocky rocks and evergreen forests around the pool are surrounded by screens. In the old days, they were called Longyuan Night Sails, and their night scenes were fascinating.