The dividing line between neighboring countries or regions; usually marked by border stones on flat land or defined by natural landmarks like watersheds or river channels.

a region or area along the border of two countries

the process of inspecting persons and cargo crossing a national border; immigration and customs check

Trade activities between neighboring countries or regions along their shared borders; often abbreviated as [[边贸|邊貿|bian1 mao4]]

measures taken by a country to monitor and regulate its borders, including the inspection of people and goods

border clash; border conflict