Guangzhou, Ningbo and Quanzhou all had maritime trade offices but they were limited to specific areas. The South Sea trade was no longer permitted in Quanzhou and only trade with Ryukyu was allowed in Quanzhou.
The cities of Guangzhou, Ningbo, and Quanzhou had designated maritime trade centers, albeit with specific geographical limitations. In Quanzhou, the South Sea trade had been terminated, while only commerce with Ryukyu was permitted within its territorial boundaries.