The ancient capital city of Xi’an is situated on the Weihe Plain (a.k.a. Guanzhong Plain) that stretches 800 li (ca. 400 kilometers) from east to west. At various times in China’s history, it has served as the capital of several dynasties. If one were to sum up all the years when it was the seat of government, one would learn that it has been a capital city longer than any other city in China.