Located on the coast of Longtandong, Jeju Island, South Korea, the Longtandong is a huge volcanic rock formed by the cooling of the lava of Hangu Mountain volcano 2 million years ago. It is shaped like a faucet and has rocks near the coast, so it is called the faucet. There is a dragon pool on the east side of the dragon head rock, which is said to be a place where dragons play, so the name of the dragon pool is also called Longyuan. The pool water is crystal clear, which is a symbol of Jeju tourism.