Visa questionfor Henygang China and for Hong Kong

I will be flying with my girlfriend (Chinese citizen) from the US to her home town of Hengyang China and from there after a brief stay we will be flying to Hong Kong to visit her family - and mu question is
will I need 2 different visas one for Hengyang and one for Hong Kong ??
I await your reply
thank you
Don B
San Diego, CA