The Horse-Tail Harbor at the exit of the River Min is the gateway to Fuzhou, and had been a place of strategic importance in history. It was garrisoned by the troops of Zheng Chenggong, a national hero in the Ming Dynasty (1368-1644), and two hundred years later Lin Zexu had artillery fortresses built at the harbor as defense against assaults by the enemy navy from the sea. " Now the harbor has been made a zone of economic and technical development. The port is accessible to 10,000-ton class steamers. Mawei Shipyard is the largest in the province.