Hi Liu. Welcome to JavaRanch.
You can get a general idea of JavaRanch geographic data
here. You can get to this url by clicking on the blue world icon at the bottom of the page and see even more information.
Also, this question is asked periodically in this forum so another possible way you might find the information you are looking for by doing a
search on this forum.
Can you be a little more specific in your question? Do you want to know what country I am originally from or what country I am currently living in or something more specific like what city I was born in or what city I am currently living in?