Which region is governed under the principle "one country, two systems"?

TRUE CANADIAN Laurel, I think you mean the UK, England is just one constitutional part of it, and they just can't win can they? When they colonised other countries that was wrong and when they give them back they 'fed them to the wolves'. I do not agree with colonisation but they shouldn't be criticised when they try to do the right thing

I don't think China allows any significant freedom there any more.

https://en.m.wikipedia.org/wiki/One_country,_two_systems#:~:text=Set%20to%20expire%20in%202047,the%20WTO%20and%20the%20Olympics). Set to expire in 2047, the current arrangement has permitted Hong Kong to function as its own entity under the name "Hong Kong, China" in many international settings (e.g. the WTO and the Olympics).