Cixi, alternately romanized as Tzeki, is a county-level city under the jurisdiction of the sub-provincial city of Ningbo, in the north of Zhejiang province, China. As of the 2020 census, its population was 1,829,488. Its urban agglomeration built-up area, largely contiguous with Cixi plus the county-level city of Yuyao, had 3,083,520 inhabitants.

Ningbo is a sub-provincial city in northeast Zhejiang province, People's Republic of China. It comprises six urban districts, two satellite county-level cities, and two rural counties, including several islands in Hangzhou Bay and the East China Sea. Ningbo is the southern economic center of the Yangtze Delta megalopolis. The port of Ningbo–Zhoushan, spread across several locations, is the world's busiest port by cargo tonnage and world's third-busiest container port since 2010.