Changzhutan or Chang-Zhu-Tan, also Greater Changsha Metropolitan Region or Changsha-Zhuzhou-Xiangtan City Cluster (simplified Chinese: 长株潭城市群; traditional Chinese: 長株潭城市群; pinyin: Cháng-Zhū-Tán Chéngshì Qún) is a city cluster in Hunan province, China, consisting of the provincial capital, Changsha and two other prefecture-level cities: Xiangtan and Zhuzhou; it is the main heavily urbanized region of Hunan and covers an area of 28,087 km2 (10,844 sq mi).
Economist Intelligence Unit identified Chang-Zhu-Tan as one of China's 13 megalopolises in its 2012 report "Supersized Cities", with an estimated 2010 population of 8.3 million and 2009 GDP of 320 million Chinese yuan (CNY)[1] Other sources put the population at 5.92 million.[2]
It covers an area of 1,883 km2 in the urban area with a population of 5.92 million, GDP reaches 568 billion CNY (US$90 billion), GDP per capita of 96,067 CNY (US$15,665), the core area of three cities (Changzhutan metropolis) had an area of 483.77 km2 in 2012.[2] On December 14, 2007, it was issued as Comprehensive Supporting Reform Trial Areas to build a resource conserving and environment friendly society by China NDRC.
The Changsha–Zhuzhou–Xiangtan intercity railway connects the three urban cores and surrounding areas.