Haimen (simplified Chinese: 海门; traditional Chinese: 海門; pinyin: Hǎimén; lit. 'sea gate', Qihai dialect: [haɪ.məŋ], Shanghai: [hɛ̝.məŋ]) is a district of Nantong, Jiangsu province, with a population of approximately 1 million. It is located at the opposite side of the Yangtze River to Shanghai and is directly north of Chongming Island except for a small portion that forms Haimen District's Haiyong Town. Haimen is the seat of the Roman Catholic Diocese of Haimen. Haimen is located in the poorer north Jiangsu region and together with Qidong City, traditionally has one of the highest rates of liver cancer in China and in the world, with upwards of 1 out of every 10 adults in the rural areas dying from liver cancer.