do we need visa? we are in hongkong and mainland china for only eight days in total.

Hi am a Singaporean passport holder. I am visiting Hongkong for a day. We are heading to Foshan by ferry for 7 days. we are flying out of guangzhou to singapore.

The website, has mentioned Singaporeans may enter through port of entry open to foreigners for fifteen days visa free. Can you please tell me the ports of entry names open to foreigners?

I am heading by ferry to Foshan. Is Foshan considered a port of entry for foreigners?
Thank you.