Chun'an is a county of Zhejiang Province, East China, it is under the administration of the prefecture-level city of Hangzhou, the capital of Zhejiang, containing the well-known Qiandao Lake and bordering Anhui province to the northwest. It has a land area of 4,452 km2 (1,719 sq mi) and a population of 450,000. The postal code is 311700, and the county seat is located on 18 North Xin'an Rd., Qiandaohu Town.