The southeast hills are the floorboard of a large area of low mountains and hills, starting from the Yangtze River in the north, reaching Guangdong and Guangxi in the south, the sea in the east and the Yunnan-Guizhou Plateau in the west. They include Anhui, Jiangsu, Jiangxi, Zhejiang, Hunan, Fujian, Guangdong and Guangxi Zhuang Autonomous Region. The altitude is mostly between 200-600 meters, and the main peak exceeds 1.500 meters. Most of these mountains are in the northeast-

In the southeast area east of Yunnan-Guizhou Plateau and south of the Yangtze River, hills and landforms are the most widely distributed and concentrated, which are collectively called "southeast hills". Among them, those located south of the Yangtze River and north of Nanling are called Jiangnan hills; South of Nanling, Guangdong and Guangxi are called Guangdong and Guangxi hills; East of Wuyi Mountain, in Zhejiang and Fujian provinces, it is called Zhejiang-Fujian Mountain. The southeast hills are located in the subtropical zone, rich in precipitation and heat, and are the mountainous areas with great potential for the development and utilization of forest, agriculture and mineral resources in China.