'Moon Harbour') was a seaport situated at the estuary of the Jiulong River in present-day Haicheng town in Zhangzhou, Fujian, China.
[2] By the beginning the 14th century, merchants were recorded to be building multi-masted oceangoing vessels in Yuegang to go to Ryukyu Islands and Southeast Asia, flouting the maritime prohibitions.
[3] Foreign goods flowed into Yuegang while Jingdezhen porcelain with Islamic designs were exported to Southeast Asian markets.
[9] Officials petitioned to establish a new administrative county at Yuegang in the early 1520s, the 1540s, and the 1560s along this line of reasoning, and finally succeeded after the death of the hardliner Jiajing Emperor.
[10] With this, along with the suppression of the lingering piracy in the area by general Yu Dayou in 1569, Yuegang was converted from a pirate den to an official trading port.
[11] Many staples of the modern Chinese diet, like the sweet potato, maize, and tomato were first introduced to China through the Yuegang trade.
[15] Architecturally, Yuegang and its surrounding areas were noticeably transformed by the foreign trade as Chinese buildings utilizing red bricks in the Roman-Islamic style appeared in the late Ming dynasty.
[21] When the sea ban was lifted after the defeat of the Zheng kingdom in Taiwan in 1684, Xiamen, not Yuegang, was made the Qing dynasty's seaport of choice in Fujian.