In the 1400s and 1500s a number of near-mythical trading ports were reported by sailors, including Brasil, Antillia, and of course, Zacton.
Zacton was somewhere in the general area of China, and was supposed to produce many valuable spices. This is a bit confusing, as our best guess for where Zacton actually is -- modern-day Quanzhou -- never really produced a lot of spices, but presumably this was based on it being a major Asian trading port.
By the mid-to-late 1800s this was largely all sorted out, although the Chinese language has remained consistently difficult for Westerners to Westernize. Zacton is probably the same port variously named Zaiton, Zayton, Tsiuenchau, Chinchew, and Quanzhou. However, it may also be the port formally known as Canton, Kwangchow, or Kwong Chow, and which now is called Guangzhou.