Jiuduansha is a collection of four intertidal wetland shoals at the mouth of China's Yangtze River. They are administered as an island region of the municipality of Shanghai's Pudong New Area.

Pudong is a district of Shanghai located east of the Huangpu, the river which flows through central Shanghai. The name Pudong was originally applied to the Huangpu's east bank, directly across from the west bank or Puxi, the historic city center. It now refers to the broader Pudong New Area, a state-level new area which extends all the way to the East China Sea.