Introduction to Longmen Peak: Longmen Peak is one of the sixteen peaks in Changbai, with an altitude of 2,595 meters. It is on both sides of the Chengcha River, opposite to Tianhuo Peak. Because of its shape like a door, it is named Longmen. According to legend, Dayu once visited here when he was controlling floods. There is a tadpole-shaped pillar next to it, which is called the sacred monument.