Dongtan is a new city planned for the island of Chongming, near Shanghai. The city should be open, with accommodation for 50,000, by the time the Expo 2010 opens in Shanghai. By 2040, the city is slated to be one-third the size of Manhattan. Dongtan is the first of up to four slated “eco-cities” to be designed and built in China by Arup, a British company. The cities are planned to be ecologically friendly, with zero-greenhouse-emission transit and complete self-sufficiency in water and energy.Ecologically sensitive design will be a key element of the masterplan.The site is mostly agricultural land adjacent to a huge wetland of global importance. This will be a significant opportunity to apply our integrated sustainability and urban planning expertise to the benefit of the eco-city.