Hai'an is a county-level city under the administration of the prefecture-level city of Nantong, in eastern Jiangsu province, China. It lies on the south-western shores of the Yellow Sea.
The city borders Dongtai to the north, Rudong to the south-east, Rugao to the south, Taixing to the south-west, and Jiangyan to the west.
Note: the subject specified for this article was a city in Guangdong, but the reference material provided describes Hai'an in Jiangsu province. This stub follows the source material.