in the zhou and shang dynasties, qingdao became the birthplace of chinese sea salt, ranking among china's "four ancient salt zones" and "five ancient harbors". during spring and autumn and warring states periods, jimo, the second biggest city in shandong province, was established here. the ancient city of jimo (located in today's pingdu city) is the earliest of its kind extant in china. king gou jian of the yue state established capital in langya (located in today's jiaonan city) and later became the overlord of the state. after unifying china, the first emperor of the qin dynasty (221~206 bc) made inspection tours in his country for five times and personally climbed onto langya terrace for three times. according to historical records
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