Chang'an is located in China

Chang'an ([ʈʂʰǎŋ.án] ( listen); simplified Chinese: 长安; traditional Chinese: 長安) is an ancient capital of more than ten dynasties in Chinese history, today known as Xi'an. Chang'an means "Perpetual Peace" in Classical Chinese. During the short-lived Xin dynasty, the city was renamed "Constant Peace" (Chinese: 常安; pinyin: Cháng'ān); yet after its fall in AD 23, the old name was restored. By the time of the Ming dynasty, the name was again changed to Xi'an, meaning "Western Peace", which has remained its name to the present day.

• http://en.wikipedia.org/wiki/Chang'an