Which sea is Chongming Island located in?

the east China sea. According to Baidu map information, Chongming Island is located at the mouth of the Yangtze River, facing the river on three sides and the East China Sea on the southeast, facing Changshu, Taicang, Jiading, Baoshan, Chuansha and Nanhui in Jiangsu in the west and south, and separated from Qidong and Haimen in Jiangsu in the east and north by a strip of water, so Chongming Island is located in the East China Sea.