Yuegang (Chinese: 月港; pinyin: Yuègǎng; Pe̍h-ōe-jī: Goe̍h-káng; lit. 'Moon Harbour') was a seaport situated at the estuary of the Jiulong River in present-day Haicheng town in Zhangzhou, Fujian, China. Known as a smuggling hub since the early Ming dynasty, Yuegang rose to prominence in the 16th century as the Ming government cracked down on other hubs of private maritime trade, deemed illegal at the time due to the isolationist haijin laws. When the prohibitions were lifted in 1567, Yuegang was designated as the port in Fujian from where it is legal to trade overseas. Since then, it flourished as the Chinese terminus of the trans-Pacific trade carried by the Manila galleon through its trade with the Spanish Philippines until it was overshadowed by Xiamen in the 17th century.