What is Long Mai in China?

Nationally, China has three Long Mai. Country-learning-big-division-Li-crown-The book "Exploration of Feng Shui" says that it is divided by four big rivers and there are three dry dragons. The mountain range extending southeast from the south of the Yangtze River is Nanlong, also called Taming Dragon. The mountain range between the Yangtze River and the Yellow River is Zhonglong, also called Zhenlong. The mountain range between the Yellow River and Yalu River is Belon, also called Genlong. The starting point of Sangan Dragon is Kunlun Mountain.