What is the main terrain of Nanyang?
Nanyang is located in the southwest of Henan province, at the junction of Henan, Hubei and Shaanxi provinces. It is a basin surrounded by mountains on three sides and open in the south. It is named because it is located in Funiu Shan Zhinan, north of Hanshui River. Nanyang basin is located in the upper reaches of Hanshui River and the source of Huaihe River, with Qinling Mountain and Funiu Mountain in the north, Daba Mountain and Wudang Mountain in the west, Tongbai Mountain and Dabie Mountain in the east, surrounded by mountains on three sides, forming a basin of 30,000 square kilometers in the middle, which is a natural capital of victory. Its geological structure is very stable, and there has been no major earthquake in 1000 years. The ancients once described "Nanyang, where martial arts are flourishing, with mountains and mountains to control, and Kuancheng Ye Ping can station troops. Near Shaanxi in the west, you can call soldiers; East to Jianghuai, grain millet can be transported; Nantong Jinghu, Bashu, can bring goods; If you refuse the northern three capitals, you can send rescue. "