National Border
noun, の adjective
A country boundary is that country's national border. Be careful about crossing it if you're carrying bananas. The border police seem to hate when you tell them you're carrying a banana in your pants when they ask you if you're bringing any fruits back. No idea why.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. The こく gets shortened to a nice little こっ.
私の妹は、この国境の向こう側にいるんです。
My younger sister is on the other side of this national border.
日本は海に囲まれているんだから歩いて国境をこえるなんて無理だよ。
It is impossible to cross the national border on foot because Japan is surrounded by seas, you know?
国境警備隊の隊員がアメリカに不法入国した外国人を国境のそばの茂みで見つけることはよくあることです。
It is common for Border Patrol agents to find foreigners who have entered the U.S. illegally in the bushes near the border.