Qin dynasty (221-207 BC), founded by the first emperor Qin Shihuang 秦始皇[Qin2 Shi3 huang2], the first dynasty to rule the whole of China

the Qin army (model for the terracotta warriors)

the state of Qin, one of the seven states of the Warring States Period (475-220 BC)

see 秦安縣|秦安县[Qin2 an1 Xian4]

Qinling Mountain Range in Shaanxi forming a natural barrier between the Guanzhong Plain 關中平原|关中平原[Guan1 zhong1 Ping2 yuan2] and the Han River 漢水|汉水[Han4 shui3] valley