10 km along the river

The Battle of Chinhai was fought between British and Chinese forces in Chinhai (Zhenhai), Zhejiang province, China, on the 10 October 1841 during the First Opium War. The Chinese force consisted of a garrison of Manchu and Mongol Bannermen. The British capture of this city allowed them to seize Ningpo unopposed on the 13 October.

For the 1841 battle, see Battle of Chinhai.The Battle of Zhenhai (Chinese: 镇海之役) was a minor confrontation that took place on 1 March 1885 between Admiral Amédée Courbet's Far East Squadron (escadre de l’extrême-Orient) and Chinese warships and shore batteries near the coastal city of Zhenhai, 12 miles (19 km) downstream from Ningbo, China during the Sino-French War (August 1884 – April 1885).

Zhenhai is a district and former county of the sub-provincial city of Ningbo in Zhejiang Province in eastern China. It has a population of 200,000.