My dear t_co, you seem to have misconceptions regarding borders. You see, a border is calculated and arrived at not just on land but also on the sea/water bodies and including air. I do not know what you will call a border in chinese but if I had known I would save you the trouble of understanding the meaning of 'border' becoz I realize that you are a bit weak in english !!!!
I believe your govt has not even allowed you the simple liberty of googling:cb:
So obviously, I am not surprised by your post :ka: