Ningbo or Ningpo (Chinese 寧波 市 / 宁波 市, Pinyin shì Ningbo, Ningbo with, "calm wave") is a coastal city of east China's Zhejiang Province. She is one of 15 sub-provincial cities (副 省级 城市) China and - to Hangzhou - the second most important city of the province. Ningbo is located in the south of the populous Yangtze Estuary region in the Ningshao level and is located opposite the East China Sea. It covers an area of ​​9,669.88 and about 5,710,000 inhabitants (2010). It is twinned with Aachen.