Qianhai Bay (QiānhǎiWān) is also known as Dachan Bay. It is located in the sea area at the junction of Nanshan District of Shenzhen City and the west of Bao'an District. The area is about 30 square kilometers. There are bays in the east and west of the Nantou Peninsula. The east is called Back Bay, and the west is called Qianhai Bay. There is Qianhai Development Zone.