You really have probelm reading and your knowledge toward the english term mainland Chian is questionable Mainland China is a geopolitical term Besides you misrepresnted the things i said I said geography is a reason which apart from other reasons i e existing legal political system that existed long before the 1997 resulted in the use of the term But somehow u read it as purely geographical You pushed so hard to add PRC s name into the 1st sentence the only reason u did this is so u can make it sounds like Hong Kong is the same as China and ignore HK s facts on autonomy What is the different between Neidi and Dalu in English anyway Show me a reference in Oxford Dictionary could u Those words don t even exist in English Oxford dictionary