demarcation
US /ˌdiː.mɑːrˈkeɪ.ʃən/
UK /ˌdiː.mɑːrˈkeɪ.ʃən/
1.
sự phân giới
a border or a rule that shows the limits of something or how things are divided:
:
•
The river serves as the line of demarcation (= the line showing the separation) between the two counties.