Noun and の adjective
こっきょう
くにざかい
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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’s common for a US Border Patrol Guard to find an illegal alien in the bushes right by the national border fence.
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.