Introduction to Echo Cliff: In the palm of the paper mache suit Beitao. The mouth of the canyon here is large and semi-cylindrical, with an arc length of more than 300 meters and an angle of 250 degrees. The wall is more than 100 meters high and is semi-enclosed. If you speak in any direction from inside the wall, you can hear a clear echo. In 1990, it was confirmed by experts as "the largest natural echo gallery in the world"