Xinyi is one of the 50 mountainous counties (cities) in Guangdong Province. More than 70% of the territory is mountainous, which is called "eight mountains, one water and one field". The terrain is high in the northeast and low in the southwest. Here is dominated by mountain landforms. There are mountains and rivers in the territory, with altitudes ranging from 50m to1704m. There are 80 peaks at an altitude of 1000 m, 37 peaks at an altitude of 500 m, and satellite topographic map 1 sheet. The highest point is Datianding, with an altitude of1704m, which is the highest peak in western Guangdong. The lowest point is the tail of Wuwen River in Beipan Village, Zhenlong Town, with an altitude of 47.8 meters. There are 2 1 river with rainfall collection area over 50 square kilometers, with a total length of 522 kilometers. This is the birthplace of Jianjiang, Huanghua and Luoding rivers. Jianjiang River Basin is the third largest basin in Guangdong Province, located in the southwest of Guangdong Province. Originated in Hubaokeng, Xinyi City, it flows through Gaozhou, Huazhou, Maoming, Dianbai and other counties and cities, and flows into the South China Sea in Shajiao, Wuchuan City. Its main stream is 23 1 km, and its drainage area is 9464 square kilometers. It is the largest river on the west coast of Guangdong. Huanghua River is a secondary tributary of the Pearl River, which originates from Datiandian in Xinyi, flows northward into Tang Jia Village in Wangsha Town, leaves Guangxi and joins Beiliu River in tengxian. The trunk line is 230 kilometers long and 98 kilometers in Xinyi. There are tributaries such as Youpai River, Guizi River, Shadi River and Zhusha River. Luoding River is actually Nanjiang River, which has been mentioned many times in history. Luoding River originates from Jilong Mountain in Xinyi, flows through Luoding and Yunan, and joins Xijiang River in Nanjiangkou Town. Although Luoding River is the shortest of the main rivers in the Pearl River system, there are many original cultures hidden in the deep mountains and valleys where it flows. Therefore, hydropower resources are abundant, with theoretical reserves of178,000 kilowatts. The river divides from north to south in the central mountainous area, and flows into the Jianjiang River system in the south and the Pearl River system in the north.
Xinyi is rich in mineral resources. There are more than 30 kinds of proven mineral resources, mainly tin, gold, copper, iron, molybdenum, manganese, zinc, tungsten, jade, kaolin, rare earth and granite. Yin Yan tin mine in China is the third largest tin mine in China, and Dongkeng gold mine is the second largest gold mine in Guangdong, with various colors of granite and a total reserve of 265,438+billion cubic meters. Jade mine is the only "Southern Jasper" in China, with soft jade, elegant stone pattern, emerald green, crystal clear as ice, yellow-green, turquoise, black and other colors. It is famous for its carving techniques at home and abroad.